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

Input: Consider Input: A visual "copy" of an object that is formed by reflected or refracted light is called image.

Output: A visual "copy" of an object that is formed by reflected or refracted light is called what?

Input: Consider Input: Glycerol is a triol, an alcohol which contains three hydroxl functional groups.

Output: Glycerol is a triol, an alcohol which contains three what?

Input: Consider Input: When water is heated by magma and makes its way to the surface and creates a(n) geyser.
Output: When water is heated by magma and makes it's way to the surface what is created?