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:
Oil is the most commonly used source of energy in the world.
answer:
What is the most commonly used source of energy in the world?

question:
If an animal eats large pieces of food it is known as a?
answer:
If an animal eats large pieces of food it is known as a?