How does radiation fog occur?, When warm air rises over cold air., When heat radiates from the ground on clear nights., When moist air rises over mountains., , Geography questions and answers, Study Online for free, egpage.com

A:	When warm air rises over cold air.
B:	When heat radiates from the ground on clear nights.
C:	When moist air rises over mountains.
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The correct answer is:

✅ When heat radiates from the ground on clear nights.

Radiation fog forms under specific conditions:

Clear Skies: Allows ground heat to escape rapidly into space (radiational cooling).

Calm Winds: Prevents mixing of air layers, letting the surface cool faster.

Moist Air Near Ground: Cools to its dew point, condensing into fog.

Occurs overnight or early morning in valleys or low-lying areas.

Dissipates after sunrise as the ground warms.

❌ Warm air over cold air: Creates advection fog (e.g., coastal fog).

❌ Moist air over mountains: Forms upslope fog.

Fun Fact: London’s infamous "pea soup fog" was often radiation fog mixed with pollution! 🌫️🇬🇧

Farmers hate it—it can frost crops! 🌾❄️

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