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: Cold fronts cause lightning. 
Question: Cold fronts cause what?
[EX A]: lightning.

[EX Q]: Fact: comparators, flats, and microscopes could be used for observing materials up close. 
Question: comparators, flats, and microscopes could be used for observing materials how?
[EX A]: up close.

[EX Q]: Fact: a jet is used for moving a large amount of people across bodies of water. 
Question: What moves people across bodies of water?
[EX A]:
jets.