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: when a lake receives too much water, a flood occurs. 
Question: When does a flood occur in a lake?
[EX A]: after too much water received.

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

[EX Q]: Fact: coal is used for generating heat and can explode. 
Question: coal is used for generating heat and can what?
[EX A]:
explode.