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.

[Q]: Question: Two felled trees, split in twain, with the same number of rings, means they're the same? Answer: age.
[A]: a tree growing a tree-growth ring occurs once per year


[Q]: Question: Which of these could be a reason why the stars seem to be in a different place at dusk than at dawn? Answer: rotation of the earth.
[A]: the Earth rotating on its axis causes stars to appear to move across the sky at night


[Q]: Question: if a person wanted some mineral graphite, where might they likely find some? Answer: in a pencil for drawing class.
[A]:
pencil lead contains mineral graphite