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

Natural resource type of resource is limited in supply and cannot be replaced except over millions of years.
What type of resource is limited in supply and cannot be replaced except over millions of years?

Plasma matter makes up most of the universe.
What type of matter makes up most of the universe?

Deep water filling a void caused by surface winds blowing water north and south is known as?

Deep water filling a void caused by surface winds blowing water north and south is known as?