WEathering and erosion
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Weathering is the breaking down of rocks, soils and minerals. There are two kinds of weathering, physical and chemical. Physical weathering is the breakdown of rocks by heat, pressure, water and ice. Chemical weathering is when biologically produced chemicals have a direct effect in the breakdown of rocks. Many of Earth's landscapes were formed by weathering and erosion.
Erosion is when soil and rock are removed from the earths surface by water or wind and
moved and deposited in different locations. It is usually a slow process but can be speeded up by human activities. Erosion can make rivers disappear or reappear, wear down mountains and fill in valleys. The most powerful type of erosion is water which can carry huge pieces of rock. Erosion begins with weathering.