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.

Fact: the moon revolving around the Earth causes the new moon. 
Question: the moon revolving around the Earth causes what?
new moon.

Fact: The crystallized rocks are made by lava from the mantle. 
Question: Where does the lava come from that makes igneous rocks?
Mantle.

Fact: Scientist find and study trace fossils are known as paleontologists. 
Question: Paleontologists are scientists who find and study what sort of fossils?

trace.