In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

Q: Question: Convection is caused by uneven what? Answer: warmness distribution.

A: uneven heating causes convection
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Q: Question: Where would rocks be the smoothest? Answer: where water has flowed for years.

A: contact between rocks over long periods of time causes rocks to smooth
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Q: Question: Tearing an object changes that object's? Answer: formation.

A:
tearing an object changes that object 's shape
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