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

Q: A crater can usually be found on the top of composite volcanoes.

A: A crater can usually be found on the top of what kind of volcanoes?
****
Q: Smaller size of ring will a summer drought cause in a tree.

A: What size of ring will a summer drought cause in a tree?
****
Q: Endoscopes are used to explore the body through various orifices or minor incisions.

A:
Endoscopes are used to explore the body through various orifices or these?
****