- Planting trees increases the number of trees in an environment
- Planting tree is a kind of human action
- Hence, planting trees is a kind of human action that increases the number of trees in an envrionment

- Rate is a kind of measure of speed
- To slow / to slow down decreases speed
- Therefore, to slow / to slow down decreases the rate of something

- To slow / to slow down decreases the rate of something
- Tree roots decrease / reduce soil erosion
- Hence, tree roots slow the rate of soil erosion

- "Transpiration is when water vapor moves from plants into the atmosphere" is not a useful statement here

- Tree roots slow the rate of soil erosion
- Roots are a part of a plant / tree
- Hence, trees slow the rate of soil erosion

- Rate is a kind of measure of speed
- To slow / to slow down decreases speed
- Hence, to slow / to slow down decreases the rate of something

- To slow / to slow down decreases the rate of something
- If something decreases something else then increasing that something will decrease that something else
- Hence, if something slows the rate of something else then increasing that something will slow the rate of that something else

- Trees slow the rate of soil erosion
- If something slows the rate of something else then increasing that something will slow the rate of that something else
- Hence, increasing the number of trees slows the rate of soil erosion

- Planting trees is a kind of human action that increases the number of trees in an envrionment
- Increasing the number of trees slows the rate of soil erosion
- Therefore, planting trees is a kind of human action that slows the rate of soil erosion

Hence, planting trees is a kind of human action that slows the rate of soil erosion
Q: Human actions can change the rate at which soil erodes. Which of the following would most likely slow the rate of soil erosion?
Context:
- Rate is a kind of measure of speed 
- Tree roots decrease / reduce soil erosion 
- Planting trees increases the number of trees in an environment 
- Planting tree is a kind of human action 
- If something decreases something else then increasing that something will decrease that something else 
- Roots are a part of a plant / tree 
- Transpiration is when water vapor moves from plants into the atmosphere
- To slow / to slow down decreases speed