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

[EX Q]: The human eye detect can detect three colors of light.
[EX A]: How many colors of light can the human eye detect?

[EX Q]: Very low density is the concentration of gas molecules in the mesosphere.
[EX A]: What is the concentration of gas molecules in the mesosphere?

[EX Q]: Fertility does the color of soil indicate.
[EX A]:
What does the color of soil indicate?