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252 - EASA BPL Hot-Air Balloon Theory in English - What process results in the formation of "orographic fog" ("hill fog")?

Question 252 - Meteorology - BPL Hot-Air Balloon Pilot Licence

Prolonged radiation during nights clear of clouds
Warm, moist air is moved across a hill or a mountain range
Evaporation from warm, moist ground area into very cold air
Cold, moist air mixes with warm, moist air

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