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

Example Input: Cloudy conditions will most likely result from a low-pressure weather system.
Example Output: Which will most likely result from a low-pressure weather system?

Example Input: Low energy causes waves to bring sand up onto the beach during summers.
Example Output: What causes waves to bring sand up onto the beach during summers?

Example Input: Atoms that have gained electrons and become negatively charged are called negative ions.
Example Output:
Atoms that have gained electrons and become negatively charged are called what?