instruction:
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.
question:
Fact: Absorbing energy causes metal objects to expand. 
Question: Metal expands when it does what?
answer:
absorbs energy.


question:
Fact: be prepared for clear, cold days after thunderstorms. 
Question: be prepared for clear, cold days after what?
answer:
thunderstorms.


question:
Fact: speciation events are an example of something that occurs over geologic time above the level of species. 
Question: speciation events are an example of something that occurs above the level of what?
answer:

species.