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why were the rocks on the river bed smooth?

Why Were The Rocks On The River Bed Smooth class=

Sagot :

the answer is actually the third one with the rushing water. The continuous flow of water down the stream gradually eroded away jagged parts of the rocks; this phenomena is actually what created the grand canyon. Over a long period of time, the flow of water can make lasting changes. 

because the water runs over them that, then makes them smooth.