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

[EX Q]: Water and humidity is the critical factor for the survival of segmented worms.
[EX A]: What is the critical factor for the survival of segmented worms?

[EX Q]: Ovulation takes place in the ovary and is part of the menstrual cycle.
[EX A]: Ovulation takes place in what organ and is part of the menstrual cycle?

[EX Q]: Rises then sinks does deeper material cause convection in the mantle.
[EX A]:
How does deeper material cause convection in the mantle?