For clouds to form, water vapor in the air must condense and change from a gas to a liquid. what must water molecules do as part of this process? a. come close together and stick to each other b. escape into the surrounding air c. connect to each other in a rigid structure d. stop moving relative to each other

The answer is option A.

That is for clouds to form, water vapor in the air must condense and change from a gas to a liquid. In this process, water molecules come close together and stick to each other.

In cloud formation process :

1) Water on earth gets heated and evaporate into the atmosphere.  

2) The water vapour on reaching a certain altitude condense to form water molecules.  

3) These water molecules come close to each other to form clouds.

A - Come close together and stick to each other.

Explanation:

the dissolution of polymer can be thermodynamically described in 2 steps.