Fact 1: Weathering means breaking down rocks from larger whole into smaller pieces by weather.

Fact 2: Massive boulders and tiny rocks influence the sound and path of water.

Given the two facts above, answer the question "What means breaking down boulders by weather?" with the following options: 
- vehicles
 - weathering
 - erosion
 - mechanical
 - flooding
 - earthquake
 - hurricanes
 - tremors


 

  weathering       