a decrease in sea level a decrease in average surface temperatures an increase in melting of polar ice caps an increase in crustal plate movement
I gave my students this multiple choice question: Most scientists agree that an increase in the amount of greenhouse gases entering Earth's atmosphere causes

Only one answer is correct among these 4 choices:
- a decrease in sea level
- a decrease in average surface temperatures
- an increase in melting of polar ice caps
- an increase in crustal plate movement

Could you tell me which one is correct?

an increase in melting of polar ice caps