Fact 1: Sediment is formed by weathering.

Fact 2: Sediment is made of rocks, dirt, and earth.

Given the two facts above, answer the question "What causes rocks, dirt, and earth to combine?" with the following options: 
- Time
 - Weathering
 - Air
 - heat energy
 - forces
 - friction
 - rainfall
 - Animals


 

  Weathering       