Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Air quality is a measure of pollutants in the air.

Answer: Air quality is a measure of what in the air?


Question: You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors.

Answer: What do you call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission?


Question: A small quake preceding a large quake is called foreshock.

Answer:
A small quake preceding a large quake is called what?