Question

why stones in river stream become round and smooth​

Answer 1

Answer:

Abrasion- Rocks collide causing the rocks to chip and become smooth. resistance- the sand creates resistance and acts like sand paper to smooth the rocks. motion of the water- The motion of the water pushes the rocks and causes the rocks to collide with the rocks and stream beds.

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Answer 2

Answer:

Abrasion - rocks collide causing the rocks to chip and become smooth. resistance - the sand creates resistance and acts like sand paper to smooth rocks . motion of water - the motion of water pushes the rocks cause the rocks to collide with rocks and stream beds