hydrosphere and biosphere troposphere and ionosphere hydrosphere and lithosphere asthenosphere and lithosphere
I gave my students this multiple choice question: When mountains are formed, there is an interaction between areas of Earth. Which two will interact and result in the formation of mountains?

Only one answer is correct among these 4 choices:
- hydrosphere and biosphere
- troposphere and ionosphere
- hydrosphere and lithosphere
- asthenosphere and lithosphere

Could you tell me which one is correct?

asthenosphere and lithosphere