Haze, fog, and clouds cannot form in the atmosphere unless relative humidity is at least 100%. A. True
B. False

B. False

Explanation:

As the hygroscopic nuclei seek out water and can condense vapor even when relative humidity is less than 100% thus, sufficient amount of these particles in the air can lead to forming a fog.  Hence, the fog and clouds a form in a lower humidity as well. As the temperature is an indicator of the air capacity the content of water vapor in the air is an indicator of this.

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