Which statement is true about a stable atmosphere?

Which statement is true about a stable atmosphere?

• A. It resists vertical motion
• B. It promotes vertical motion
• C. It has high humidity
• D. It is always cold

Answer: (A)

A stable atmosphere resists vertical motion because a lifted air parcel becomes cooler and denser than the surrounding air, giving it negative buoyancy that makes it sink back toward its original level. This buoyant restoring force suppresses vertical movement, so convection and tall cloud development are limited and the air tends to remain layered. Humidity or temperature alone don’t define stability. Moisture can affect how much an ascending parcel cools, but stability is about how the air responds to vertical displacement. And stability doesn’t imply it’s always cold—stable conditions can occur in warm or cool air as long as displaced parcels return to their original level.

A stable atmosphere resists vertical motion because a lifted air parcel becomes cooler and denser than the surrounding air, giving it negative buoyancy that makes it sink back toward its original level. This buoyant restoring force suppresses vertical movement, so convection and tall cloud development are limited and the air tends to remain layered.

Humidity or temperature alone don’t define stability. Moisture can affect how much an ascending parcel cools, but stability is about how the air responds to vertical displacement. And stability doesn’t imply it’s always cold—stable conditions can occur in warm or cool air as long as displaced parcels return to their original level.