Discussion
Which process clears radiation fog in the morning?
Answer: A
Sunlight penetrates the fog and heats the ground, which then warms the air from below, mixing the fog upward until it evaporates. Dense fog reflects much of the sunlight and so persists longer, which is why some winter fogs survive the whole day. Droplet settling is far too slow to clear a fog layer, and drier air arriving from elsewhere would be a change of air mass rather than a clearance of the existing one. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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