instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Deep currents are caused by differences in density at the top and bottom of the ocean.
answer:
What is caused by differences in density at the top and bottom of the ocean?

question:
Aqueous solution is used to describe a solution in which water is the solvent.
answer:
What term is used to describe a solution in which water is the solvent?

question:
A carbon atom with 6 protons and 8 neutrons is more specifically known as carbon 14.
answer:
A carbon atom with 6 protons and 8 neutrons is more specifically known as?