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

[EX Q]: Intraplate earthquakes occur because solid lithosphere travels on a round planet.
[EX A]: What occur because solid lithosphere travels on a round planet?

[EX Q]: Mercury is not a solid even at room temperature.
[EX A]: Which metal is not a solid even at room temperature?

[EX Q]: According to the law of conservation of energy, energy can never actually be "consumed"; it can only be changed from one form to another.
[EX A]:
Fuels according to the law of what, can never actually be "consumed"; it can only be changed from one form to another?