instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Moving air masses is the main reason for weather change.
answer:
What is the main reason for weather change?


question:
A wall of rocks or concrete a called a groin.
answer:
What is a wall of rocks or concrete called?


question:
Inner core of the following earth layers has the greatest density.
answer:

Which of the following Earth layers has the greatest density?