Question

Which is not caused by human interactions with the Earth system?

A. Deforestation
B. Air pollution
C. Mountain building
D. Water pollution

Answer 1

Your Answer would probably be C.
Humans do not build natural Mountains 

Answer 2

C. Mountain building.

The fast removal of trees from a forest would likely not be able to happen so quickly if it wasn't for humans. The machines normally cause water and air pollution, eliminating the rest of your pollution.