In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: What type of friction is friction that acts on objects when they are sliding over a surface? Answer: sliding friction

A: Sliding friction is friction that acts on objects when they are sliding over a surface.
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Q: Question: What type of creature is a scallop? Answer: mollusk

A: A scallop is a(n) mollusk.
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Q: Question: Which is a more reliable trait or measure to identify minerals? Answer: streak

A:
Streak is a more reliable trait or measure to identify minerals.
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