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

Ex Input:
Rubber is an example of a(n) insulators that does not allow electrons to move through them.

Ex Output:
Rubber is an example of what type of substances that do not allow electrons to move through them?


Ex Input:
Glaciers deposit their sediment when they melt.

Ex Output:
When do glaciers deposit their sediment?


Ex Input:
We call water that has been used for cleaning, washing, flushing, or manufacturing wastewater.

Ex Output:
What do we call water that has been used for cleaning, washing, flushing, or manufacturing?