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m. (1) Unless their temperatures, pressures, and relative humidities are very similar

(2) Two different air masses normally do not mix when they meet

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III. VOCABULARYEXPANSION: Oral Exercises

Select the word from the three given to complete the sentences.

1. condense condensation condensed

a. Sometimes moisture in the air ___________________ on a cool surface and forms
drops of water.

b. Fog and clouds are a result of the __________________________of moisture in
the air.

c. The _____________________ moisture forms 1arger and larger drops

d. Evaporation and ______________________ are two processes that relate to

moisture in the air.

2. saturate saturation saturated

a. The air is _______________________ , it can't take up any more moisture.

b. Often, when precipitation falls through a lower layer of air,_____________________

of the lower layer occurs.

c. Come in out of the rain, your clothes must be ________________________________ .

d. First the rain ________________________ the ground, then the water starts to
collect on the surface.