Fact 1: Sediment is formed by weathering.

Fact 2: All sediments originate from the weathering and erosion of older rocks.

Given the two facts above, answer the question "What causes sediment to form?" with the following options: 
- soils
 - tectonic plates
 - magnets
 - water
 - rivers
 - wind
 - loose soil
 - erosion


 

        erosion 