Fact 1: Decomposition increases amount of organic matter in soil.

Fact 2: Composting is simply the natural decomposition of organic matter.

Given the two facts above, answer the question "What increases the amount of organic matter in soil?" with the following options: 
- raining
 - shedding
 - mussels
 - raking
 - herbicide
 - fossil fuels
 - green manures
 - composting


 

        composting 