How does this step ensure that the new angle will be congruent to the original angle?

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

The creation of the trans-siberian railway allowed people to travel across russia. how could this railway impact russian culture?

What id the primary human cause of the global warming a. storage of nuclear fuel rods b. burning of fossil fuels c. building of high-density housing d. violent conflicts over natural resources