Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Q: Fact: expansion can cause fatigue. 
Question: what can cause fatigue?

A: expansion.
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Q: Fact: a scale is used for measuring grams. 
Question: what is a scale used to measure?

A: grams.
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Q: Fact: erosion is caused by the ocean's tides resulting from gravitational pull. 
Question: Gravitational pull causes tides, which causes what to happen to the land?

A:
erosion.
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