World Geography 2b
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| Erosion | Gradual wearing away of sand, soil, or rock by wind or water
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| Deposition | Gradual building up of eroded material in a new location
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| Earthquake | A shifting of the plates that make up Earth's surface.
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| Flooding | Overflow of water that covers typically dry land.
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| Volcanic Eruptions | Lava, ash, gas, and rock coming up through the Earth's crust
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| Aral Sea | Once the 4th largest body of fresh water, now nearly gone due to farmers diverting water for irrigation.
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| Dams | Built to control flooding and generate hydroelectric power by controlling when and how much water goes down river.
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| Colorado River | A series of dams, reservoirs, and water storage to control and supply water to the Western U.S.
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| Canals | A man-made waterway used for transportation
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| Reservoirs | A man-made lake built to store water for irrigation or drinking.
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| Irrigation | Diverting water from its natural course to farmland to help grow crops
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| Agricultural terracing | Turning a hill into a series of flat shelves to make farming easier
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| Polders | An area of low-lying land reclaimed from the sea or a river and protected by dikes. Most associated with the Netherlands
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| Deforestation | Removing the trees and other vegetation from an area
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| Desertification | Fertile land turning into desert. Typically the result of human caused droughts, deforestation, or poor agricultural practices
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| Acid Rain | Precipitation that is altered from normal due to human pollution. Can be dangerous to plants and animals.
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| Pollution | Introduction of non-natural chemicals to the environment by humans
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| Climate change | A potential change in the world climate due to human pollution and environmental decisions.
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