Question

Robbie found a rock in a stream. The rock was smooth and round. What MOST LIKELY caused this to happen?

A. the summer sun
B. Earth's magnetic poles
C. weathering by water
D. cold winters

Answer 1

C, weathering by the water.

Step-by-step explanation:

While in the river, it scraps againsts other rocks and things, which causes it to change shape. For example be smoother and round.