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

Example Input: Pangaea began breaking apart 250 million years ago.
Example Output: How many millions of years ago did pangaea begin breaking apart?

Example Input: Diffraction is the phenomenon in which light and sound waves become circular at the point source of a barrier.
Example Output: What is the phenomenon in which light and sound waves become circular at the point source of a barrier?

Example Input: The soil beneath a deciduous forest is called pedalfer.
Example Output:
The soil beneath a deciduous forest is called what?