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

The metallic bond is responsible for the properties of metals.
What is responsible for the properties of metals?

Deep currents are caused by differences in density at the top and bottom of the ocean.
What is caused by differences in density at the top and bottom of the ocean?

When drinking water is treated, the term for when chemicals cause solids in the water to clump together is coagulation.

When drinking water is treated, what is the term for when chemicals cause solids in the water to clump together?