You are presented with the question "What causes sediment to form?" and the following answer choices: 
- soils
 - tectonic plates
 - magnets
 - water
 - rivers
 - wind
 - loose soil
 - erosion

Now knowing that sediment is formed by weathering and all sediments originate from the weathering and erosion of older rocks, choose the best answer.


 

        erosion 