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Erosion


Definition
The process in which wind, water, ice, or other things move pieces of rock and soil over Earth's surface (related word: erode)
 
Key Context
Next time you go to a stream, look at the stones in the water. The stones at the bottom are rounded because the moving water has polished their rough edges. This is caused by erosion. Erosion changes the earth’s surface by moving pieces of rock and sand. Wind, rain, running water, waves, and glaciers, can break apart the earth as they move.