Question

State whether the following is common knowledge or material that should be credited. There is enough concrete in Hoover Dam to pave a standard highway, sixteen feet wide, from San Francisco to New York City.
- Common Knowledge

- Material that should be credited

Answer 1

I would say it is probably common knowledge, because it isn't someone else's idea, but if you found it online or in an article you would probably want to credit any thoughts, ideas, or quotes. Be sure to state whose calculated this number also.