instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Adding the number of protons plus the number of neutrons in an atom decides its approximate mass; atomic number is another word for this value.
answer:
Adding the number of protons plus the number of neutrons in an atom, decides it's approximate mass, what is another word for this value?


question:
10 million years long can a large star be on the main sequence stage.
answer:
How long can a large star be on the main sequence stage?


question:
Upwelling is the term for when deep ocean water rises to the surface.
answer:

What is the term for when deep ocean water rises to the surface?