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See all Premium member Presentation Transcript Natural Disasters : Natural Disasters Adapted from Natural Disasters By Ben Darin Natural Disaster Database : Natural Disaster Database Avalanche Earthquakes Hurricanes Landslides Thunderstorms Floods Monsoons Tornados Tsunami Volcanoes Avalanches : Avalanches Avalanches Happen on every continent Avalanche Season is during the “winter time” or December-April in the United States A large scale can release up to 300,000 cubic yards of snow Avalanches are more commonly released by recreationists than by natural causes The biggest factor of avalanche possibility is the accumulation snow over the winter season More snow = bigger avalanche Earthquakes : Earthquakes Earthquakes are caused by the release of built up pressure caused by the shifting of tectonic plates Earthquakes usually occur on fault lines, or areas where tectonic plates meet The size of an earthquake is measured using the logarithmic based Richter scale An aerial view of the San Andreas fault in the Carrizo Plain, Central California Hurricanes : Hurricanes A hurricane is a tropical storm with winds over 74mph Hurricanes occupy the most intense level of the three levels of tropical storms Hurricanes rotate or circulate counter-clockwise in the northern hemisphere Hurricanes can only occur over the Atlantic ocean, Caribbean sea, and gulf of Mexico View of a Hurricane from Space Landslides : Landslides Landslides are the movement of land down a slope by gravity Landslides are mother nature’s way of redistributing land They can be triggered by rain, floods, and earthquakes as well as man-made factors such as slope grading or mining Landslides have the potential to happen anywhere a steep slope is present Thunder Storms : Thunder Storms Every Thunderstorm produces lightning There is wet thunder and dry thunder, the difference being whether or not rain in produced Warm humid conditions favor thunderstorms Only 10% of thunderstorms are classified as severe Your chance of being struck by lightning is 1 in 600,000 Multiple Lightning Strikes and a Supercell Thunderstorm formation Floods : Floods A flood is caused by excess water surpassing the limits of its confines. A flood can happen during a myriad of events, including heavy rainfall and overflowing river banks. Floods present a significant danger with enough force to sweet away massive objects such as cars and trees. Monsoons : Monsoons The monsoon is a wind current in Southern Asia, blowing northeast during the summer and southwest during the winter. During the summer, the monsoon brings heavy rains to southern Asia and Africa, while in the winter it causes the drier seasons. The lives of many people in these areas have developed around these seasonal changes. While the wet monsoon brings much needed rain to many areas, it often also causes flooding, in addition to crop and infrastructure damage. Tornados : Tornados A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground Tornados are found in almost every part of the world Tornados are most common in the United States, just east of the Rocky Mountains in an area called Tornado Ally Waterspouts are weak tornados over water and can move inland and become tornados Slide 11: A blizzard is a severe storm condition characterized by low temperatures, strong winds, and heavy snow. Blizzard Slide 12: Drought A drought (or drouth [archaic]) is an extended period of months or years when a region notes a deficiency in its water supply. Tsunamis : Tsunamis On the seafloor, volcanic eruptions, earthquakes, and even landslides can lead to tsunamis Tsunamis can travel over 300mph Tsunamis can have an amplitude of up to 32ft Hawaii is the most vulnerable place in the world for tsunamis Volcanoes : Volcanoes Volcanoes are lava filled mountains that erupt when the pressure becomes to great for them to hold it inside The contents that a volcano spews forth is called magma when it’s below the surface and lava once it reaches the surface Only a fraction of the world’s volcanoes are actually on land, the rest are on the ocean floor Indonesia has the most volcanoes of all the countries in the world Human Threats Database : Human Threats Database Arson Pollution Deforestation Toxic Waste Global Warming Endangered species Desertification Arson : Arson Arson is the crime of intentionally and maliciously setting fire to structures or wildland areas. It may be distinguished from other causes such as spontaneous combustion and natural wildfires. Pollution : Pollution Pollution is the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms. Deforestation : Deforestation Deforestation is the clearance of naturally occurring forests by logging and burning. Deforestation occurs for many reasons: trees are used as, or sold, for fuel or as a commodity, while cleared land is used as pasture for livestock, plantations of commodities, and settlements. Deforested regions typically incur significant adverse soil erosion and frequently degrade into wasteland. Toxic Waste : Toxic Waste Toxic waste is waste material that can cause death or injury to living creatures. It spreads quite easily and can contaminate lakes and rivers. It usually is the product of industry or commerce, but also comes from residential use, agriculture(e.g. chemical fertilizers, pesticides), the military (nuclear weapons testing, chemical warfare), medical facilities (e.g. pharmaceuticals), radioactive sources, and light industry, such as dry cleaning establishments. Endangered Species : Endangered Species An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters. Also it could mean that due to deforestation there may be a lack of food and/or water. The International Union for Conservation of Nature (IUCN) has calculated the percentage of endangered species as 40 percent of all organisms based on the sample of species that have been evaluated through 2006. Desertification : Desertification Desertification is the extreme deterioration of land in arid and dry sub-humid areas due to loss of vegetation and soil moisture; desertification results chiefly from man-made activities and influenced by climatic variations. It is principally caused by overgrazing, overdrafting of groundwater and diversion of water from rivers for human consumption and industrial use, all of these processes fundamentally driven by overpopulation. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.