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Frost forms on cold surfaces when condensation occurs:

ABelow freezing point
BAbove freezing point
COnly at the dew point
DOnly in free air aloft
Answer & Solution
Correct answer: A. Below freezing point
1. Moisture is deposited as ice crystals. 2. Frost needs condensation below 0 C. 3. Other conditions match those for dew. _Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 11, Water in the Atmosphere._
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