Fogs and Clouds 115 
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WHAT IS A CLOUD? 
Fogs and clouds are portions of the atmosphere containing 
large numbers of fine water droplets or tiny ice spicules. Fun- 
damentally there is no difference between fogs and clouds 
Cirrocumulus. 
except for the fact that a fog rests upon the earth, whereas a 
cloud floats above the earth. They result from the fact that 
the ability of the air to hold moisture is very strongly de- 
