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

[EX Q]: Seismic waves prove the inner core it is solid.
[EX A]: What do seismic waves prove about the inner core?

[EX Q]: Hybridization model model helps explain molecules with double or triple bonds.
[EX A]: Which model helps explain molecules with double or triple bonds?

[EX Q]: The planets orbit around the sun.
[EX A]:
The planets orbit around what celestial body?