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A natural disaster is the effect of a natural hazard that affects the environment, and leads to financial, environmental and/or human losses. It may be caused by land movement, water, or weather disasters. Land movement disasters are caused by rapid flow of snow down a slope, sudden shaking of the Earth's crust, mudflow or debris flow composed of pyroclastic material, or expulsion of lava or tephra from a volcanic vent or fissure. This book studies various types of land movement natural disasters including gravity current, avalanche dam, epicenter, mudslide, and lava.
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