Meteorology · Stability
An atmosphere is unstable when a lifted parcel of air:
- AContinues to rise on its own because it stays warmer than its surroundings✓ Correct
- BSinks back to its origin
- CStays at the same level
- DCannot hold moisture
Explanation
In an unstable atmosphere a displaced parcel remains warmer (less dense) than its environment and keeps rising, favoring cumulus/cumulonimbus and showers. Stable air resists vertical motion, favoring stratus and fog.
Authority: Bowditch (Pub. No. 9), atmospheric stability
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