Task: Question Answering
Input (English): Process:  -Particles in the environment interact with rocks -The particles remove small pieces of the rock each time they touch the rocks -The particles continue to hit, brush against, or grow against the rocks -The rock eventually is broken apart by this contact -The pieces of the rock are now small rocks -The rock pieces are worn away into smaller and smaller pieces by the same forces -
 Question: What is the effect of less particles are in the environment on less pieces of rock are removed.?
Output (English): for