Fact 1: Mechanical weathering is when rocks are broken down by mechanical means.

Fact 2: Erosion begins with the weathering, or breaking down, of rocks and soil.

Given the two facts above, answer the question "What is it called when rocks are broken down mechanically?" with the following options: 
- mines
 - dangerous
 - coral reef
 - cracking
 - tube
 - loose soil
 - calcite
 - erosion


 

        erosion 