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

[Q]: Question: Decomposition? Answer: adds to the components needed to sustain life in the soil.
[A]: decomposition increases the amount of nutrients in the soil

[Q]: Question: Who famously explicated the science of dropping something? Answer: Newton.
[A]:
dropping something causes that something to fall