What two kinds of fog are the result of adding moisture to a layer of air? a) radiation and upslope
b) advection and radiation
c) steam and frontal
d) upslope and steam

B

Explanation:

Development of fog by radiation occurs mainly over land when the land loses heat by radiation. The land hence cools the atmosphere above. The moisture in this air then reaches dewpoint and fog forms.

Development of fog by advection can occur over both land and water. It involves warm moist air mass moving over a cool/cold land or water and hence the warm moist air cools and the moisture in it reaches dew point forming fog.

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