Weathering of Rock
The fell on the of the and weathered them. Weathering can happen in several ways.
Rain can enter cracks in the rock. At night it freezes into and expands, breaking open the rock.
Rain also contains chemicals called which can attack the rock. The rock breaks down into , and . These are carried along in streams but the sand and clay soon sinks to the bottom. The minerals are carried away in the streams which collect to make .
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