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

Ex Input:
All enzymes have an optimal temperature and ph.

Ex Output:
All enzymes have an optimal temperature and what?


Ex Input:
Water leaves ponds and lakes through evaporation and also as outflow.

Ex Output:
Water leaves ponds and lakes through evaporation and also as what?


Ex Input:
Rises then sinks does deeper material cause convection in the mantle.

Ex Output:

How does deeper material cause convection in the mantle?