In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Q: Sentence: Mountain building and earthquakes are some of the responses of rocks when subected to stress. Question: Mountain building and earthquakes are some of the responses of rocks when subected to what?

A: stress
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Q: Sentence: Density describes how much matter is in a certain amount of space. Question: What describes how much matter is in a certain amount of space?

A: density
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Q: Sentence: The octet rule is a result of trends in energies and is useful in explaining why atoms form the ions that they do. Question: Which rule is a result of trends in energies and is useful in explaining why atoms form the ions that they do?

A:
octet rule
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