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.

[Q]: Fact: erosion forms canyons. 
Question: What are formed by erosion?
[A]: canyons.


[Q]: Fact: when an earthquake causes the ground to shake, this shaking can damage buildings. 
Question: How do earthquakes cause damage to buildings?
[A]: The shaking of the ground causes damage to buildings.


[Q]: Fact: a stopwatch is used to help people be punctual. 
Question: What is a stopwatch used for?
[A]:
punctuality.