Which was the only empire to include a saharan salt mine

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?

Can i have all the nicknames of all 50 states of usa?

The banking act of 1933, also known as the glass-steagall act, established the federal deposit insurance corporation (fdic), which a protected banks from failure by ensuring that the government would bail them out if necessary. b required american taxpayers to establish an account with a commercial bank. c protected depositors from financial losses when banks failed.