In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

Q: Fact: a ruler is used for measuring the length of an object.

A: Length of object.
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Q: Fact: melting is when solids are heated above their melting point.

A: melting dissolve.
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Q: Fact: Some precipitation that falls on land may soak into the ground, becoming groundwater.

A:
groundwater falls.
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