chemical weathering mechanical weathering water erosion wind erosion
I gave my students this multiple choice question: Many natural rock formations change color over time. In Utah, for example, iron oxidized and formed red, orange, and yellow rock. Which of the following is the cause of this change?

Only one answer is correct among these 4 choices:
- chemical weathering
- mechanical weathering
- water erosion
- wind erosion

Could you tell me which one is correct?

chemical weathering