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

Momentum is directly related to both mass and velocity.
Momentum is directly related to both mass and?

Intraplate earthquakes occur because solid lithosphere travels on a round planet.
What occur because solid lithosphere travels on a round planet?

Biomass is an example of a renewable energy resource.
Which is an example of a renewable energy resource?