Why is vertical cloud development greater in an unstable atmosphere?

Correct answer: Because rising air remains warmer than surrounding air and keeps rising

Correct answer: A. In an unstable atmosphere, a lifted parcel of air can remain warmer and less dense than the surrounding air. Because it is buoyant, it continues to rise rather than quickly returning to its original level. As the moist parcel rises, pressure decreases, it expands and cools, and condensation may form cloud droplets. Continued buoyant ascent builds clouds upward, often producing cumulus or cumulonimbus forms. B is wrong because instability depends on a temperature relationship between the parcel and its surroundings, not on the absence of temperature differences. C is wrong because water vapour condenses or deposits into water and ice, not rock. D is wrong because instability promotes upward motion. Memory cue: “Unstable air supports vertical growth; stable air limits it.”