Answer: 
Rainfall causes most of the erosion on Earth. 
Step-by-step explanation: 
- Erosion is a 'geological process' where the materials on Earth are worn away by the natural elements like water and wind. 
 
- Liquid water is the major element for erosion. Most erosion on the planet is caused by the glaciers(melting ice). 
 
- Rainfall too causes erosion when bits of sand and soil are slowly washing away the sediments. 
 
- There are 'four types' of rainfall erosion namely-Splash, Sheet, Gully and Rill erosion.