Fact 1: Wind and rain cause erosion.

Fact 2: Soil Erosion Soil erosion is a natural process.

Given the two facts above, answer the question "what is a natural process?" with the following options: 
- manufacturing
 - Reproduction
 - driving a car
 - rain and wind
 - flooding
 - gene flow
 - influenza
 - pure


 

    rain and wind     