The steam that can be seen coming out of a boiling kettle consists of condensing water droplets. These water droplets move upward with the hot water vapor coming out of the kettle. The process of hotter air rising and cooler air falling is called convection. What role does convection play in the atmosphere?
A. Convection makes the air warmer at higher altitudes.
B. Convection currents distribute heat in the atmosphere.
C. Convection prevents the air in the atmosphere from moving.
D. Convection transfers heat from the atmosphere to the ocean.