Is air an element, compound, homogeneous mixture, or a heterogeneous mixture?

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

What happens when an acid dissolves?

Why did southern business leaders want to increase the number of slaves