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

Input: Consider Input: Intraplate earthquakes occur because solid lithosphere travels on a round planet.

Output: What occur because solid lithosphere travels on a round planet?


Input: Consider Input: The water in some springs are hot because they're heated by hot magma.

Output: The water in some springs are hot because they're heated by what?


Input: Consider Input: Metal is regularly used in human hip and knee implants.


Output: What material is regularly used in human hip and knee implants?