When warm air rises at the
equator, how does cooler air
move?

When warm air rises, cool air sinks down, which creates a high pressure zone. Then cool air flows back towards the equator, and warm again, which creates a cycle.

Warm air rises, creating a low pressure region, and cool air sinks, creating a high pressure zone. Air flowing from areas of high pressure to low pressure creates winds. Air moving at the bases of the three major convection cells in each hemisphere north and south of the equator creates the global wind belts.