Changes on Earth's Surface
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| weathering | The breakdown of rock at or near the earth's surface into smaller pieces
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| mechanical weathering | The actual breaking up or physical weakening of rock by forces such as ice and roots
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| chemical weathering | The process by which the actual chemical structure of rock is changed, usually when water and carbon dioxide cause a breakdown of the rock
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| acid rain | Rain whose high concentration of chemicals, usually from industrial pollution, pollutes water, kills plant and animal life, and eats away at the surface of stone and rock. a form of chemical weathering
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| erosion | The movement of weathered materials, including gravel, soil, and sand, usually caused by water, wind, and glaciers
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| sediment | Particles of soil, sand, and gravel carried and deposited by wind or water
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| loess | Fine-grained, mineral-rich loam, dust, or silt deposited by the wind
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| glacier | A huge, slow-moving mass of snow and ice
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| moraine | A ridgelike mass of rock, gravel, sand, and clay carried and deposited by a glacier
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