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

Example Input: Some compounds form rigid frameworks called crystals.
Example Output: Some compounds form rigid frameworks called what?

Example Input: Ovulation takes place in the ovary and is part of the menstrual cycle.
Example Output: Ovulation takes place in what organ and is part of the menstrual cycle?

Example Input: Geothermal power is generated via underground sources of heat.
Example Output:
What type of power is generated via underground sources of heat?