Answer:
chemically breaking rocks apart
Explanation:
First, lets talk about erosion:
Erosion is the process of eroding or being eroded by wind, water, or other natural agents.
Erosion can be either a fast process, or one that takes hundreds of years.
Water can fall in cracks of rock, later then freeze and expand causing to break rocks more.
Answer: Chemically breaking rocks apart.
Explanation:
Because erosion usually happens because of the flow of water. So the water has sand particles that hit the rock which breaks the rock.