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

Ex Input:
Diffusion is the term for the movement of molecules from an area of high concentration to an area of low concentration.

Ex Output:
What is the term for the movement of molecules from an area of high concentration to an area of low concentration?


Ex Input:
A electron microscope is used to see extremely small objects.

Ex Output:
What type of microscope is used to see extremely small objects?


Ex Input:
Terminal speed is another name for critical speed.

Ex Output:
What is another name for critical speed?