In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[EX Q]: Question: If a rub two rocks together after awhile they will start to? Answer: Get smooth.
[EX A]: contact between rocks over long periods of time causes rocks to smooth

[EX Q]: Question: Which is an electrical energy conductor? Answer: cobalt.
[EX A]: metal is an electrical energy conductor

[EX Q]: Question: Why would something appear blue? Answer: it reflects the same wavelength as the sea.
[EX A]:
if an object is blue then that object reflects only blue light