Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Deep currents are caused by differences in density at the top and bottom of the ocean.

Output: What is caused by differences in density at the top and bottom of the ocean?


Input: Consider Input: Does water get colder or warmer the deeper you go?

Output: Does water get colder or warmer the deeper you go?


Input: Consider Input: Aufbau principle gives the order of electron filling in an atom.
Output: What gives the order of electron filling in an atom?