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1. Because water vapor molecules are lighter than nitrogen or oxygen molecules,

a. Hot air rises
b. Air pressure is low at high altitudes
c. Humid air is lighter than an equal volume of dry air at the same temperature
d. Clouds form in cold fronts

User Inquilabee
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2 Answers

4 votes
The answer is A I think
User Bengineer
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4 votes

Answer:

your answer should be A if not try C

Step-by-step explanation:

User BadMonkey
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