1. Clear sky |
2. Calm air |
3. Low relative humidity |
4. Temperature below freezing point |
A) 1, 2 and 3
B) 1, 2 and 4
C) 2, 3 and 4
D) 1, 3 and 4
Correct Answer: B
Solution :
When relative humidity is low sufficient moisture is not available in the air and frost is not formed.You need to login to perform this action.
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