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.

Question: A ball rolling over carpet will go ______ than a ball rolling over concrete.? Answer: slower.
as the roughness of something increases , the friction of that something will increase when its surface moves against another surface

Question: If things are deposited consistently in dark, cavernous area, then a thing that could develop is? Answer: a stalactite.
stalactites are formed by deposition

Question: Which is a source of raw materials? Answer: an oil field.

if something is a raw material then that something comes directly from a source

