large fields of gravel a tall mountain chain large freshwater lakes linked by rivers an uneven thickness of sedimentary layers
I gave my students this multiple choice question: Which of the following has been formed on the Asian continent by two continental plates that have been pressing together for millions of years?

Only one answer is correct among these 4 choices:
- large fields of gravel
- a tall mountain chain
- large freshwater lakes linked by rivers
- an uneven thickness of sedimentary layers

Could you tell me which one is correct?

a tall mountain chain