Answers

2016-07-22T16:36:23+08:00
Erosion-a soil has been carried away

an erosion happens when a tree has been cut down because a tree holds soil due to its root 
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Erosion relies on transporting agents such as wind, rivers, ice, snow and downward movement of materials to carry weathered products away from the source area. As weathered products are carried away, fresh rocks are exposed to further weathering. Over time, that mountain or hill is gradually worn down.