TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Water leaves ponds and lakes through evaporation and also as outflow.

SOLUTION: Water leaves ponds and lakes through evaporation and also as what?

PROBLEM: Human facial expressions can communicate emotions.

SOLUTION: What can human facial expressions communicate?

PROBLEM: The surface of the sun is much hotter than almost anything on earth.

SOLUTION:
How hot is it on the surface of the Sun?