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: Faulting of rock in the Earth's crust can cause a tsunami. 
Question: What can be caused by a faulting of the earth's crust?

Answer: a tsunami.


Question: Fact: Puberty begins the last stage of life before adulthood. 
Question: The last stage of life before adulthood begins with?

Answer: puberty.


Question: Fact: Vibrations in air can be used for communication by animals. 
Question: Vibrations in air can be used for what by animals?

Answer:
communication.