If two stars have the same absolute magnitude, what can be a reason for the difference in their brightness?

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.

Astate's representation in the u. s. senate is based on a) equal representation. b) the state's population. c) the state's electoral votes. d) the size of their major cities. this independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren cthis independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren commission (wc) b) federal election commission (fec) c) equal opportunity commission (eoc) d) securities and exchange commission (sec)

The process by which liquid water changes into water vapour is called what ?