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

Input: Consider Input: 2 hydrogen, 1 oxygen atoms combine to make up a molecule of water.

Output: What atoms combine to make up a molecule of water?


Input: Consider Input: Water seeping into the ground is known as infiltration.

Output: Water seeping into the ground is known as?


Input: Consider Input: The earth's magnetic poles have switched places repeatedly in the past.
Output: The earth's magnetic poles have done what repeatedly in the past?