Discussion
Convection represents the vertical movement of :
Answer: A
Convection is the vertical movement of warmer air upward and cooler air downward.
Air heated at the ground is less dense than its surroundings and rises buoyantly; to replace it, cooler, denser air sinks. The overturning carries heat upward and builds cumulus clouds.
Cooler air rising and warmer air sinking runs against buoyancy and would happen only if forced. Options C and D each describe only half of the exchange, and in the wrong sense.
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