TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The pupil is the name of the black opening in the eye that lets light enter.

SOLUTION: What is the name of the black opening in the eye that lets light enter?

PROBLEM: The sun and the moon appear to be about the same size in the sky because the moon is smaller in diameter and is closer to earth than the sun.

SOLUTION: Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?

PROBLEM: It boils water particles become hot enough to overcome the force of attraction between them, what happens to the water.

SOLUTION:
When water particles become hot enough to overcome the force of attraction between them, what happens to the water?