Question

drag the missing word into place
and in time, the warm air cools and sinks back down,
creating a current that keeps air moving
and the wind blowing.
pressure
dense
convection

Explanation:

A convection current occurs when warm air rises (as it is less dense) and then cools and sinks (becomes denser again). This cycle of rising and sinking air forms a convection current which is responsible for air movement and wind. The term "pressure" refers to force per unit area and is not the specific term for this air - movement cycle. "Dense" is an adjective describing the state of matter (how closely packed the particles are) but not the name of the current.

Answer:

convection