Reaction Paper Title Page Essay

â€Å"The music is all around us, all you have to do is listen.† August Rush a 2007 drama film directed by Kirsten Sheridan and written by Paul Castro, Nick Castle, and James V. Hart, and produced by Richard Barton Lewis. Music has been part of our lives since memorable times. Undoubtedly, it has touched us at least once. Most people would agree that music is what helps someone to feel better or just to change one’s mood. In fact, different researches have already found a variety of benefits that it can bring. Advantages in the sensory area as well as in the emotional and cognitive ones are the most interesting topics that this current paper will analyze. Thus, one could understand and give much importance to Music in daily life. The sensory area involves everything related to senses and touch is one of them. According to Forgeard, 2008; Hyde, 2009; Schlaug et al., 2005; â€Å"Music enhances fine motor skills. Motor function is the ability to use small, acute muscle movements to write, use a computer, and perform other physical activities essential for classroom learning. The parts of the brain associated with sensory and motor function are developed through music instruction†. This helps to understand how important is music in the motor skills developing especially in children. One might clearly notice how difficult playing an instrument is; however, with practice it becomes easier. Hence, motor skills are developed. Children would become better in small movements like writing if playing an instrument is in their lives. Let us tackle on another benefit, emotions are part of any body and music may help us to change them depending on the situation. For example, when people want to feel relaxed, one thing they do is just play some music. Some people consider music as a relaxing tool in any area like work, school, home, etc. For instance, Jolkoyski points out that â€Å"Music gives pleasure and expresses nuances of emotional life for which there are no words†. Doubtless; the beat, lyrics, voice, melody or only the sound of any piece of music makes a person feel in a different place where nothing else exists. Then, by listening to music one can enter to an own world. Provided that music moves emotions, it also influences mood. There should be always a song which can change one’s attitude. For this reason; when someone is not calm enough; a soft song like a classical one can move it into relaxation. However, it depends on people’s likes because others could feel calmed with different genre. According to Bridget O’Connell â€Å"The effect of different types of music on mood will largely depend on people’s individual preference and experience† all depends on what people are into or love. Then, music helps a lot when emotions are involved. To the same extend, music plays an important role in the cognitive area. Researches have established that many different processes in the brain can be developed through music. â€Å"There’s some good neuroscience research that children involved in music have larger growth of neural activity than people not in music training. When you’re a musician and you’re playing an instrument, you have to be using more of your brain,† says Dr. Eric Rasmussen, chair of the Early Childhood Music Department at the Peabody Preparatory of The Johns Hopkins University. As a matter of fact, one can easily become good at certain activities if music forms part of his life. Therefore, music should be included in all places so that cognition could wake up in a strong way. By the same token, Professor Nina Kraus, director of the Auditory Neuroscience Laboratory at Northwestern University points out â€Å"To learn to read, you need to have good working memory, the ability to disambiguate speech sounds, make sound-to-meaning connections, each one of these things really seems to be strengthened with active engagement in playing a musical instrument.† Then one can say that music helps our brain and the cognitive area in fact. Consequently, many different aspects in the cognitive development can be improved when music appears. To sum up, music will always form part of our lives. Good advantages could be taken if one notices how useful music is. Good sensory, emotions or cognitive would be the results of it. Thus, music should be in us since we are conscious of it and then anyone can be benefit of it. References http://well.blogs.nytimes.com/2012/09/10/early-music-lessons-have-longtime-benefits/ http://www.sheknows.com/parenting/articles/814331/10-reasons-why-your-child-should-play-a-musical-instrument-1 http://www.netdoctor.co.uk/healthy-living/wellbeing/health-benefits-of-music.htm http://www.pbs.org/parents/education/music-arts/the-benefits-of-music-education/ http://www.aep-arts.org/wp-content/uploads/2012/08/Music-Matters-Final.pdf

Why Are Young People Predisposed to Negative Influence

Why Are Young People Predisposed to Negative Influence Raising children is never easy. It takes a lot of time, patience, and understanding to make sure your children end up on the right path. Raising children is never easy. It takes a lot of time, patience, and understanding to make sure your children end up on the right path. While you might do everything you can to teach them the right way to behave and live life, that doesnt mean that there isnt a chance that something isnt going to cause them to stray. Many people feel that some children are more rebellious by nature. They think that it doesnt matter what the parents say or do because children are going to behave a certain way regardless of what you teach them. That isnt necessarily the case. Children End Up Being Rebellious for Many Reasons When children act up, many end up saying it is because they were born that way and it is just their nature. While this might be a simple way out, it isnt the case. No child is born rebellious or wants to act out of control. It is something that they pick up on over the years. Children tend to be rebellious for a number of other factors. SEXUAL CONTENT ON TV HAS A NEGATIVE IMPACT ON TEENAGERS Something like having their parents divorce can cause a child to become rebellious. They act out because they want attention and dont feel like they are getting enough attention now that one parent is out of the home. It is a cry for help. They are letting you know that there is something going on emotionally and they need a little extra help to get through the ordeal. They arent acting up and going against you because they are hard-wired that way. By taking the time to learn whats really going on beneath the surface, you can begin the healing process and help turn things around for your child. It only takes your being willing to listen and work with them to get things going in the right direction once again. Rebellion Doesnt Equal Negative Influences While all children are going to push the boundaries at some point in time or another, that doesnt mean that they are always going to be that way. Many associate rebellious children as those who are always going to do the wrong thing and hang out with the wrong crowd. Sure, that might happen every now and again, but it isnt necessarily the norm. There are a number of rebellious children who have a lot of positive influences in their life on a regular basis. In fact, they were probably just like their peer group at one point. That is  until something happened that changed their life around and caused an upset in it. Negative Influences Are Everywhere As much as you might want your children only to hang with the right crowds and do the right things, you cannot control everything going on in their lives. There will always be negative influences out there for your children to deal with on a regular basis. The key is being able to teach them the differences between what is right and what is wrong and helping guide them on the right path. Even though you arent always going to be there to make the decisions for them, you can try to help in any way you can by preparing them for what they might face on a regular basis. SINGLE-PARENT CHILDREN BEHAVIOUR Negative influences will always be around. Whether it be in the form of peer pressure, a co-worker, friend, family member or something else, you cannot escape it. The only thing you can do is to take the time to make sure your children know what they should or shouldnt be doing and how to deal with any negative situations that might arise. Growing up is difficult enough already. By taking the time to try and prepare your children for everything the world holds in store for them as they grow older, you can make things a little easier and far less stressful. Remember, no child sets out to be rebellious. There is always something else going on beneath the surface that you need to address.

Get a job in sales with no experience

Get a job in sales with no experience Are you facing this classic career conundrum: You’re interested in getting a job in sales, which often requires sales experience, but you’re new to the field and don’t know how to break in. How do you get a job that often requires experience when you’re just starting out?Don’t let these questions derail you from pursuing a career in sales- there are pathways forward, even without a packed resume. Consider the following strategies if you’re interested in getting a job in sales but lack experience.Start at the bottom.This is a traditional way of starting out in a new industry or field- but it’s still relevant and effective today! Consider working under an experienced salesperson or sales team in an industry that interests you- perhaps as an assistant or intern if feasible- and make the most of that opportunity to learn the ropes and get your feet wet. Not only will you learn the ins and outs of sales, you’ll also have valuable exp erience that you can include on your resume.Highlight transferable skills.Revisit your resume in an effort to spin the work experience you do have to highlight your â€Å"sales potential.† Think about the qualities that good salespeople possess- are you talented at public speaking and delivering presentations? Do you have experience convincing colleagues of the value of your ideas on projects? Perhaps you’re a negotiating whiz with a track record of proven results? These are all transferable skills- they’ve served you well in your current or past positions and they’re potentially valuable skills in the world of sales. Make sure your resume’s bullet points and your cover letters make a convincing case for why this is true.Sell yourself in interviews.If you’ve followed the previous advice and made a great case in your resume and cover letter regarding your transferable skills and have landed an interview for a sales job, then congratulations- you’ve made a big first step forward. Your next step is to consider your interview as your first big sales challenge- you’re about to face a potentially tough â€Å"client† and your goal is to â€Å"sell† them on the idea that you’re worth taking a chance on!Before the day of the interview, make sure your persuasive skills are razor sharp, come equipped with real-world examples of how you’ve used your transferable, sales-related skills in previous positions effectively, and practice selling individuals- perhaps a friend, colleague, or family member- on the idea of hiring you for a sales job. Consider this time and effort an investment in your career goals.Do your homework.Another feather you can add to your job-hunting cap is a deep knowledge of each company you’re pursuing, along with some core industry knowledge. Invest some time in researching the field and how the company stacks up against the competition. Look for things that imp ress you about the company and be sure to include them in your cover letter as reasons why you’re eager to join the team. Also consider learning and dropping a few key sales industry terms in your cover letter- but don’t overdo it or it could come off as more pandering than knowledgeable.Face the challenge!When you’re going after a job in sales but have little or no experience, you’re facing an uphill challenge. You need to work extra hard in order to tip the odds in your favor, and the strategies listed here will help you do just that. The rest is up to you!

Corporate Social Responsibility (CSR) in Samsung Essay

Corporate Social Responsibility (CSR) in Samsung - Essay Example Corporate social responsibility is a commitment by an organization to integrate responsible and ethical behaviour that contributes to both the economic development of the society and improves the quality of the life of the workforce, their families and the society by extension. It is a requirement today for firms to provide an annual report on the corporate responsibility status and how they intend to improve on such a situation (Yoo-Chul, 2010). Samsung is electronic manufacturing multinational that is based at the Samsung town in Seoul, South Korea and was founded by lee Byung-Chul in 1945; Samsung has grown to be one of the leading manufacturers of household electronics and other computer devices. It operates a number of conglomerates in different countries where most of its products are manufactured before distribution to the international markets. Samsung electronics, one of Samsung subsidiaries is the leading information technology companies according to a report released in 20 12 based on the revenues of the company. The company controls a sizeable influence of the economic and political policies that shape the development of the home country and is thus a powerful image in the country (Raymond, 2010). Samsung’s corporate social responsibilities Samsung has adopted a greater approach to corporate social responsibility that has contributed immensely to its development and growth and also to the positive image it has both in the home and international markets. This paper seeks to analyze the practices adopted by the company as part of their social corporate responsibility practices and how these practices has had an influence on the local and international markets (Lee, 2007). Samsung electronics believes that in their quest to realize sustainable growth and business performance that improves the value of the business, responsibility to the corporate citizens and the local communities must be improved. As a result, the company has developed a number of programs that aim at improving the lives of the people both within and without its ranks. The company, in line with this resolution established a social contribution program that seeks to help people with need within the local communities. In this program launched in 1995, all employees are enlightened on the need to contribute towards improving the life of the general population especially of those communities around the company’s establishments (Samsung Inc, 2011). A social contribution secretariat was developed by the company to coordinate the collection of the funds from the employees before developing framework on how it will be used. Experts in these secretariats develop policies that support employee’s volunteer programs that are part of the company’s corporate social responsibility program. The CSR motto of Samsung is ‘another family’ to illustrate the commitment of the company to the society as a whole just like any family within the soc iety would do. This program supports better future for the teenagers, assist children from low income families and the implementation of a family wellbeing program. In 2007, as part of the secretariats commitment to social responsibility, over 2500 company employees volunteered to contribute to in undertakings that were geared towards improving the lives of the surrounding communities (United Nations, 2009). Active involvements in societal activities improve an organizations image and

Australian Aboriginal Music and the Didjeridu Research Paper

Australian Aboriginal Music and the Didjeridu - Research Paper Example There is a diversity of culture among Aboriginal communities that is exhibited in the diversity of music, techniques, songs, and instruments. Ethnomusicology in Australian Aboriginal Culture Ethnomusicology is the art of using various approaches in defining music which is connected to a certain nation, group and ethnicity. This study helps in researches that are directly linked to a cultural group and the musical instruments that are used in their composition. It is openly expressed that ethnomusicology focuses on the cultural issue that connects the musical instruments to their culture (Atherton 48). The culture is steadfast and the musical instruments and musical composition will try to emphasize this fact. Similarly, the musical compositions state the need for the social setup during such cultural practices. In the ancient time, musical instruments and cultural music were savored as important activities that strengthened the culture of a community. As such, the generations that us ed this kind of social setting still use this as a social entertainment in their culture (Kaye 37). Similarly, the cultural instruments and music are used as a material to pass information to the community. This includes cognitive and biological dimensions which are expressed to the community. Since ethnomusicology is considered a Western culture, the cultural affiliations are rife in this part of the world. This explains why Australian Aboriginal music still thrives up to date. Though some of the western people are distanced from the cultural affiliations and music, they still have a soft spot for this kind of music and cultural practice (Atherton 48). It is known to instill the aspect of originality while serving the purpose of entertainment. Focusing on the... This "Australian Aboriginal Music and the Didjeridu" describes ethnomusicology in Australian aboriginal culture, types of traditional aboriginal music, instruments, and importance of the music. Ethnomusicology is the art of using various approaches in defining music which is connected to a certain nation, group and ethnicity. This study helps in researches that are directly linked to a cultural group and the musical instruments that are used in their composition. It is openly expressed that ethnomusicology focuses on the cultural issue that connects the musical instruments to their culture (Atherton 48). The culture is steadfast and the musical instruments and musical composition will try to emphasize this fact. Similarly, the musical compositions state the need for the social setup during such cultural practices. In the ancient time, musical instruments and cultural music were savored as important activities that strengthened the culture of a community. As such, the generations that used this kind of social setting still use this as a social entertainment in their culture (Kaye 37). Similarly, the cultural instruments and music are used as a material to pass information to the community. This includes cognitive and biological dimensions which are expressed to the community. Since ethnomusicology is considered a Western culture, the cultural affiliations are rife in this part of the world. This explains why Australian Aboriginal music still thrives up to date. Though some of the western people are distanced from the cultural affiliations and music, they still have a soft spot for this kind of music and cultural practice (Atherton 48). It is known to instill the aspect of originality while serving the purpose of entertainment. Focusing on the sociological perspective, it is seen that Australian music and musical instruments are displaying continuity in the Aboriginal culture. There has been an increase in the number of scholars that have directed their study towards Aboriginal music and culture. This is due to the strong aspect of originality in playing the instruments and the cultural music. In Australia, the didjeridu is an instrument that has managed to thrive through the years. Up to date, the instrument is savored as it exposes Australian cultural mu sic (Bos 21). In making a strong point out of this activity, the people studying Aboriginal Australian music have increased the theoretical framework of studying these particular cultural expressions in music.

Blogger (or the general idea of blogs).Learning with technology ( look Essay

Blogger (or the general idea of blogs).Learning with technology ( look at attachment) - Essay Example In schools and in the field of education, electronic and digital technologies have also become valuable companion tools for learning. The internet is filled with websites like Wikipedia, Google Scholar, Google Books, and Blogs which serve as compiled sources of information which students can easily access without having to comb through library books, journals, and encyclopaedias. Blogging and the general idea of blogs have become one of the more relevant eLearning tools. This paper shall evaluate blogging, its applications and uses. A critical analysis of this learning tool shall also be carried out. The first part of this paper shall provide an overview of blogging. The second part shall provide a critique of blogging. The third part shall discuss the learning theories which are applicable to blogging. The fourth part shall use a specific blogging application and discuss its links with learning theories. Finally, this paper shall end with summarizing and concluding remarks. Body Ove rview of blogging The second generation of internet and web use has brought on the Web 2.0 phenomenon, a progression from the initial Web 1.0 design. Where the Web 1.0 design only provided for a unilateral flow of information, the Web 2.0 design has presented with the distinct improvement of sharing information to the online community (Anderson, 2008). The convenient possibilities of the internet has allowed the process of sharing, uploading, and writing information; and editing wikis and blogs has presented educators with myriad tools for their trade. Blogs, shortened from web logs, was first suggested by Jorn Barger when he came up with a webpage which included information, personal musings, journal entries, as well as links, and posts which have been arranged by date (Anderson, 2008). Since then, blogs have largely evolved, taking in more elaborate designs, and topics; and it now even includes an area for readers to post their comments. In effect, the commenting and posting proce ss seems to have allowed blogging to take on a more interactive nature, allowing readers to offer their opinion on the blogs. Blogs also allow bloggers to consider reader’s opinions, to possibly respond to these if he so desires (Anderson, 2008). Blogging is also a media which feeds a writer’s immediacy, allowing him or her to post as often as he would like without having to wait for a date of publication as is so often seen in news or magazine articles. Blogs include words which are ‘tagged’ and in so doing the subject of the post is often categorized and archived into a standard theme where it can later be recalled. By clicking the tags or entering these words into search engines, other related links would appear, thereby allowing the reader to read other similar articles by the same or different authors (Anderson, 2008). Linking is an essential part of blogging because it increases the depth of the discussions, allowing readers to understand the blog be tter (Anderson, 2008). Linking has the same nature as referencing as it gives readers the opportunity to verify the contents of the blog and to compare it to outside sources. Through these links, the quality of each blog is often significantly improved. Blogs are a new means of interacting online as it is a forum by which internet users can pool their knowledge and opinions about a certain topic (Johnson and Kaye, 2005). They are also specific avenues for combined news and data, as

Volcanoes Risks and Benefits Essay Example for Free

Volcanoes Risks and Benefits Essay The term volcano can either mean the vent from which magma erupts to the surface, or it can refer to the landform created by the solidified lava and fragmental volcanic debris that accumulate near the vent. One could say, for example, that large lava flows are erupted from Kilauea volcano in Hawaii, the world volcano here signifies a vent. Volcanoes are not the realm of any single scientific discipline. Rather they require study from many scientists from several specialties: Geophysicist and Geochemist to probe the deep roots of volcano; Geologist to decipher prehistoric volcanic activity; Biologist to learn how life became established and evolve in barren volcanic islands; and meteorologist to determine the effects of volcanic dust and gases on the atmosphere, weather and climate. Volcanoes affect humankind in many ways. Their destructiveness is awesome, but risk involved can be reduced by assessing volcanic hazards and forecasting volcanic eruptions. Body Volcanoes Risks and benefits  Definition First of all, we should know what a volcano is. Volcano is an opening in the earth’s surface. Through this opening has come rock so hot that it is in a liquid or gaseous state. This melted rock deep in the earth is called magma. Philosophers once thought that volcanic eruptions came from the burning of natural fuels. Sir Charles Lyell and his associates later showed the volcanic mountains were piled up from the products of their own eruptions For hundreds of years, volcanoes have struck terror and wonder into the heart of man. In ancient time, they even moved man into worship. The word volcano comes from Volcanus, the name of the Roman god of fire. The name was first used for volcano, one of the Lipari Islands in the Mediterranean Sea where the god was thought to live. Kinds of Volcano Volcanoes are commonly classified as active, dormant and extinct. The distinction between the categories is not very clear and consequently any classification based on this criterion and is highly arbitrary. The separation of dormant and extinct volcanoes is particularly difficult. A volcano may lie quiet many hundreds of years and then awaken, often violently. Some volcanoes are constantly active . Izalco in El Salvador, and Stromboli in the Mediterranean Sea, erupt so regularly that they have been compared to light houses. Those that are quiet, but have not been dead for us to know when they will break out again are called dormant volcanoes. Volcanoes that have been remained quiet since the beginning of recorded history and probably will not erupt are called extinct volcanoes. Other volcanoes can be called intermittent because, they erupt fairly at regular periods. Many of these erupt in cycles, with the length of cycle being fixed by the amount of time needed to make enough heat to produce eruption. Types of eruption In classification schemes based on character of eruption, volcanic activity and volcanic areas are commonly divided into six major order of increasing degree of explosiveness: (1) Icelandic, (2) Hawaiian, (3) Strombolian, (4) Vucanian, (5) Pelean and (6) Plinian. The Icelandic type of eruption is characterized by effusion of basaltic lave that flow from long parallel fissures. Such outpouring build lave patterns. The least violent type of eruption is termed Hawaiian and is characterized by extensive lava flows from central vents or fissures and occasionally accompanied by lava ountains. Strombolian eruption is characterized by moderately fluid lava flows, usually accompanied by violent lava-fountaining that produces and abundance of volcanic bombs and cinders. Vulcanian eruptions are characterized by viscous lava that form short, thick lava flows around vents; very viscous or solid fragment of lava are violently ejected from these vents. Pelean eruptions are similar to vulcanian eruptions but have even more viscous lava; domes from over the vents, and ash flows commonly accompany the dome fountais. Plinian eruptions, also known as Vesuvian eruptions, are volcanic eruptions marked by their similarity to the eruption of Mount Vesuvius in AD 79 (as described in a letter written by Pliny the Younger, and which killed his uncle Pliny the Elder). Plinian eruptions are marked by columns of gas and volcanic ash extending high into the stratosphere, a high layer of the atmosphere. The key characteristics are ejection of large amount of pumice and very powerful continuous gas blast eruptions. Risks Volcanoes release volcanic hazards that may cause the life of human kind to be in danger. These volcanic hazards are Pyroclastic Density Currents (pyroclastic flows and surges), Lahars, Structural Collapse: Debris flow-Avalanches, Dome Collapse and the formation of pyroclastic flows and surges, Lava flows, Tephra fall and ballistic projectiles, volcanic gas, Tsunamis and Volcanic Lightning Pyroclastic density currents are are gravity-driven, rapidly moving, ground-hugging mixtures of rock fragments and hot gases. This mixture forms a dense fluid that moves along the ground with an upper part that is less dense as particles fall toward the ground. The behavior of the fluid depends upon the solids concentration relative to the amount of hot gases. High concentration density flows are called pyroclastic flows and are essentially nonturbulent and confined to valleys. Low concentration density flows are called pyroclastic surges which can expand over hill and valley like hurricanes. Temperatures may be as hot as 900 degrees Celsius, or as cold as steam. Pyroclastic flows and surges are potentially highly destructive owing to their mass, high temperature, high velocity and great mobility. Deadly effects include asphyxiation, burial, incineration and crushing from impacts. Many people and the cities of Pompeii and Herculaneum were destroyed in 79 AD from an erupion of Mount Vesuvius; 29,000 people were destroyed by pyroclastic surges at St. Pierre, Martinique in 1902; 2000 died at Chichonal Volcano in southern Mexico in 1982 from pyroclastic surges. The only effective method of risk mitigation is evacuation prior to such eruptions from areas likely to be affected by pyroclastic density currents. Lahars are part of the family of debris flows that are fluids composed of mixtures of water and particles of all sizes from clay-size to gigantic boulders. The abundance of solid matter carries the water, unlike watery floods where water carries the fragments. Debris flows have the viscous consistency of wet concrete, and there is a complete transition to watery floods. Lahars are composed of volcanic particles and originate directly or indirectly from volcanic action. Lahars can form by hot pyroclastic surges or flows entering watershed systems or flowing over snow and ice, by eruptions through crater lakes, by heavy rains on loose volcanic debris that is, any process by which volcanic particles can become saturated by water and move downs lopes. They can move with velocities as low as 1. m/s to as great as 40 m/s on steep slopes (1 m/s = 2. 55 miles per hour). They are known to have travelled as far as 300 km (1 km = 0. 63 miles). Lahars have destroyed many villages and lives living on Indonesian volcanoes because most people live in valleys where lahars flow. The 21,000 lives lost at Armero, Colombia, were from a lahar that formed during the eruption of Nevado Del Ruiz in 1985. It was generated by melt water from the interaction of pyroclastic surges with snow and ice, from a very small eruption. Lahars can transform into regular floods as they become increasingly diluted with water downstream. This phenomenon was first discovered at Mount St. Helens where hot pyroclastic surges transformed to lahars, which further transformed to hyper concentrated stream flow and then to normal stream-flow turbulence. The eruption of Mount St. Helens on May 18, 1980 started with a relatively small volcanic earthquake that caused collapse of the north side of the volcano because it was over steepened and therefore unstable. When the landslide occurred, it decreased the pressure on the pressurized interior of the volcano which expanded explosively to form a lateral blast that devastated the countryside north of the volcano. Most of the debris flow avalanche was diverted down the North Fork Toutle River, but some moved directly northward over a 300 meter ridge and down into the next valley. Since the 1980 Mount St. Helens eruption, dozens of volcanoes that have given rise to avalanches have been discovered. For example, 40 avalanches exceeding 1 Km3 in volume, and 22 with a volume of less than 1 km3, are now known from the Quaternary alone, and 17 historic volcanic avalanches have been identified. The hilly topography north of Mount Shasta in northern California is now known to be the result of a have debris-flow avalanche. Some are known to extend up to 85 km from their sources and to cover tens to more than 1000 km2 in area. Lava flows rarely threaten human life because lava usually moves slowly a few centimeters per hour for silicic flows to several km/hour for basaltic flows. An exceptionally fast flow at Mt. Nyiragongo, Zaire (30-100 km/hour) overwhelmed about 300 people. Major hazards of lava flows burying, crushing, covering, burning everything in their path. Sometimes lava melts ice and snow to cause floods and lahars. Lava flows can dam rivers to form lakes that might overflow and break their dams causing floods. Methods for controlling paths of lava flows: (1) construct barriers and diversion channels, (2) cool advancing front with water, (3) disruption of source or advancing front of lava flow by explosives. Tephra consists of pyroclastic fragments of any size and origin. It is a synonym for pyroclastic material. Tephra ranges in size from ash (2 mm) to lapilli (2-64 mm) to blocks and bombs (64 mm). Densities vary greatly, from that of pumice (0. 5) to solid pieces of lava with density about 3. 0. Blocks from basement material may exceed 3. 0. Material may be juvenile (formed of magma involved in the eruption) or accidental (derived from pre-existing rock). Tephra fall and ballistic projectiles endanger life and property by (1) the force of impact of falling fragments, but this occurs only close to an eruption, (2) loss of agricultural lands if burial is greater than 10 cm depth, (3) producing suspensions of fine-grained particles in air and water which clogs filters and vents of motors, human lungs, industrial machines, and nuclear power plants, and (4) carrying of noxious gases, acids, salts, and, close to the vent, heat. Burial by tephra can collapse roofs of buildings, break power and communication lines and damage or kill vegetation. Even thin (2 cm) falls of ash can damage such critical facilities as hospitals, electric-generating plants, pumping stations, storm sewers and surface-drainage systems and sewage treatment plants, and short circuit electric-transmission facilities, telephone lines, radio and television transmitters. When dispersed widely over a drainage basin, tephra can change rainfall/runoff relationships. Low permeability of fine ash deposits leads to increased runoff, accelerated erosion, stream-channel changes and hazardous floods. In contrast, thick, coarse-grained deposits closed to the source can increase infiltration capacity and essentially eliminate surface runoff. Many of the hazards of tephra falls can be mitigated with proper planning and preparation. This includes clearing tephra from roofs as it accumulates, designing roofs with steep slopes, strengthening roofs and walls, designing filters for machinery, wearing respirators or wet clothes over the mouth and nose because tephra can contain harmful gases adsorbed on the particles as acid aerosols and salt particles. Magma is molten rock containing dissolved gases that are released to the atmosphere during an eruption and while the magma lies close to the surface from hydrothermal systems. The most abundant volcanic gas is water vapor; other important gases are carbon dioxide, carbon monoxide, sulfur oxides, hydrogen sulfide, chlorine, and fluorine. The gases are transported away from vents as acid aerosols, as compounds adsorbed on tephra and as microscopic salt particles. Sulfur compounds, chlorine and fluorine react with water to form poisonous acids damaging to the eyes, skin and respiratory systems of animals even in very small concentrations. The acids can destroy vegetation, fabrics and metals. Atmospheric veils of dust or acid aerosols caused by large-volume explosive eruptions can affect regional or global climate. Most volcanic gases are noxious and smell bad, but they can cause mass fatalities. A rare case of mass deaths by volcanic gases in 1986 at Lake Nyos, in Cameroon, West Africa. Tons of carbon dioxide spilled out of Lake Nyos, and flowed silently down a canyon and through 3 villages occupied by 1700 people. They and 3000 cattle died instantly from lack of oxygen. Carbon dioxide emissions are now being monitored at Mammoth Mountain, California. A tsunami is a long-period sea wave or wave train generated by a sudden displacement of water. Tsunamis travel at very high speeds through deep water as low broad waves and build to great heights as they approach the shallow bottom of shores. Most are caused by fault displacements on the sea floor, but many have been caused by volcanic action. The eruption of Krakatau in 1883 produced tsunamis that killed 36,000 people. The pyroclastic flow generated by this eruption displaced the water that initiated the tsunamis.