Question

A geologist is studying the shore along a river. She finds a pile of rocks at the base of a riverbank. These broken rock pieces are the result of . A little farther along the river, the geologist finds some smaller pebbles in a very shallow, slow-moving section of the river.

Answer 1

The answer is Erosion, which is the the gradual destruction or diminution of something -- in this case, rocks. I hope this helps! For reference/perspective, sand is the product of rock erosion, because it's really just tiny remnants of crushed rock. Those "small pebbles" could be sand, but you'd have to emphasize just how small they are -- one grain of sand is just that: a grain