Which statement correctly contrasts stable and unstable atmospheric conditions?

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Multiple Choice

Which statement correctly contrasts stable and unstable atmospheric conditions?

Vertical stability is about how air parcels respond to being moved up or down. In a stable atmosphere, a parcel that is lifted becomes cooler and denser than its surroundings, so buoyancy acts to pull it back down. This resists vertical motion and keeps the air from rising freely. In an unstable atmosphere, the lifted parcel remains warmer and less dense than the surrounding air, so buoyancy makes it rise further, enhancing vertical motion and promoting convection. The statement that combines these ideas—stable resists vertical motion, unstable promotes convection—best captures the contrast. Neutral conditions, by contrast, don’t strongly push air back or push it upward, so they don’t fit as well.

Vertical stability is about how air parcels respond to being moved up or down. In a stable atmosphere, a parcel that is lifted becomes cooler and denser than its surroundings, so buoyancy acts to pull it back down. This resists vertical motion and keeps the air from rising freely. In an unstable atmosphere, the lifted parcel remains warmer and less dense than the surrounding air, so buoyancy makes it rise further, enhancing vertical motion and promoting convection. The statement that combines these ideas—stable resists vertical motion, unstable promotes convection—best captures the contrast. Neutral conditions, by contrast, don’t strongly push air back or push it upward, so they don’t fit as well.

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