What happens in a global convection cell?

A. Cool air moves upward in the center; warm air moves downward at

the edge.

O

B. Warm air and cool air move in circles, causing hurricanes and

tornadoes.

O

C. Cool air and warm air repeatedly collide, pushing air up and

causing storms.

O

D. Warm air moves upward in the center, cool air moves downward at

the edge