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Weathering Study Guide Weathering Erosion Weathering is the slow breaking apart or wearing away of rock into smaller pieces. Erosion is the movement of weathered rock material from one place to another. Four causes of weathering Causes of Erosion •Moving water – the cause of most of weathering in Georgia. Rocks are moved along by river and stream water and rub against other rocks making them smooth. •Wind – causes weathering when it picks up small rock particles and blows them against larger rocks. Wind – bits of rock and soil are blown against other rocks causing them to break off and be carried away by the wind. Moving water – rivers and streams can move bits of rock and soil from the sides and bottom of a river bed. •Ice – water seeps into the cracks of rocks and can freeze. When the water freezes it expands making the crack larger. Glaciers – large mass or slow-moving ice that flows down a slope. •Growing plant roots – plants sometimes grow in the cracks of rocks. As the plant roots grow the cracks widen. Caverns form by weathering and erosion. A cavern is a large cave that is underground. When acid rain drains into the Earth the acid carries away the rock and makes a cave. Deposition •Deposition is the dropping of sediment by wind, water, ice, or gravity. •Deposition takes place when moving water slows down. •A delta is formed at the mouth of river when sediments are dropped. Weathering Rocks are broken apart. Erosion Deposition Rocks are moved to Rocks are dropped another location. into the new location.