You are presented with the question "What is caused by weathering?" and the following answer choices: 
- Water expanding
 - fish
 - loose dirt
 - rainfall
 - Rocks
 - kale
 - farms
 - flooding

Now knowing that sediment is formed by weathering and loose dirt, or sediments, from plowed fields is also a form of agricultural pollution, choose the best answer.


 

   loose dirt      