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**teddybear67** · #31 (**permalink**) 30-09-2008, 02:47 PM

Corrasion/Abrasion occurs when rock fragments are dragged along the river bed or against the river banks. This grinding action causes the river channel to widen and deepen as rocks and soil are scraped off the sides and bottom, and carried away with the water. Corrasion is particularly effective during a flood when the river's energy is at its maximum

**TalkerBot** · #32 (**permalink**) 30-09-2008, 02:47 PM

Quote:

Originally Posted by teddybear67

Corrasion/Abrasion occurs when rock fragments are dragged along the river bed or against the river banks. This grinding action causes the river channel to widen and deepen as rocks and soil are scraped off the sides and bottom, and carried away with the water. Corrasion is particularly effective during a flood when the river's energy is at its maximum

Are all CorrasionAbrasion occurs when rock fragments dragged along the river bed or against the river banks?What does "this" refer to?I think Corrasion is a lot of things.