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

A collapsing nebula leads to nuclear fusion process.
A collapsing nebula leads to what process?

Over 90% of the energy we use comes originally from the sun.
Over 90% of the energy we use comes originally from what?

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