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

Input: Consider Input: Water seeping into the ground is known as infiltration.

Output: Water seeping into the ground is known as?

Input: Consider Input: You call the separation of ions that occurs when a solid ionic compound dissolves dissociation.

Output: What do you call the separation of ions that occurs when a solid ionic compound dissolves?

Input: Consider Input: Unstable isotopes give off particles and energy as radioactivity.
Output: Unstable isotopes give off particles and energy as what?