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When cold front passes over an area then
1. temperature decreases.
2. relative humidity increases.
3. sky becomes clear.
Select the correct answer using the codes given below.

1 only
1 and 2 only
1 and 3 only
1, 2 and 3
Explanation:
Relative humidity (RH) decreases when cold front passes over an area.Cold fronts are associated with clear sky and weather while warm fronts have clouds and rainfall.
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