Question

how does convection occur in the troposphere?
the suns rays heat earths surface.
warm air rises and cool air sinks.
the warm ground heats the air above it.
the suns electromagnetic waves reflect off clouds.

Explanation:

Convection is defined as the transfer of heat through the movement of a fluid (in this case, air). In the troposphere, when air is warmed, it becomes less dense and rises; cooler, denser air then sinks to replace it, creating the convection cycle. The other options describe related processes but not convection itself: the Sun heating the surface is the initial energy source, the ground heating air is conduction, and reflection off clouds is a radiative process.

Answer:

B. Warm air rises and cool air sinks.