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: Density of matter reflects how closely packed the particles of matter are. Question: What physical property of matter reflects how closely packed the particles of matter are?

A: density
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Q: Sentence: Beta decay occurs when an unstable nucleus emits a beta particle and energy. Question: What occurs when an unstable nucleus emits a beta particle and energy?

A: beta decay
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Q: Sentence: A convergent plate boundary is created when two plates come toward each other. Question: A convergent plate boundary is created when two plates do what?

A:
come toward each other
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