What atmosphere layer do birds fly in?

Acontinental polar air mass foms in

Plz hury on a timer which statements explain what happens at deep-ocean trenches? check all that apply. crust is formed. mountains are formed. seafloor spreading occurs. crust becomes molten rock. denser plates slide under lighter plates.

The nations of indochina a. share a common langauge b. share a common history c. share a common religion d. none of the above