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.

[EX Q]: Fact: mountain barriers can influence local weather changes. 
Question: what can mountain barriers influence?
[EX A]: local weather.

[EX Q]: Fact: glass causes bending of light rays. 
Question: what does glass cause?
[EX A]: bending light rays.

[EX Q]: Fact: When a wave reaches your ear, your ear drum vibrates and you can hear it. 
Question: What does your ear drum do when it hears something?
[EX A]:
Vibrates.