TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The mass remains the same does burning matter affect its mass.

SOLUTION: How does burning matter affect its mass?

PROBLEM: The opening in the front of the eye is called pupil.

SOLUTION: What is the opening in the front of the eye called?

PROBLEM: It takes 24 hours for the earth to make a complete rotation of its axis.

SOLUTION:
How long does it take for the earth to make a complete rotation of its axis?