Given the question: Process:  - Water seeps into rocks - The water freezes and thaws - Cracks form in the rocks - Cracks also form when rocks heat up - The rocks slowly break down.  Perturbation hypothesis: suppose there has been more rain than usual happens, how will it affect MORE or FASTER weathering occurring.  Does the supposed perturbation have an effect (direct or indirect) on the process?
The answer is:
yes