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

Water leaves ponds and lakes through evaporation and also as outflow.
Water leaves ponds and lakes through evaporation and also as what?

Potential energy type of energy is possessed by autumn leaves before they fall.
What type of energy is possessed by autumn leaves before they fall?

The chemical symbol of positive metal ion ion is written first in ionic compounds.
The chemical symbol of which ion is written first in ionic compounds?