How many times a year does the sun shine into the Lascaux cave?

According ti the following map, what are the most common mineral resources found in the united states?

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine