The water in all these rivers,
lakes, and oceans is constantly rising into the air in what is called
moisture or vapor. We can not see this moisture, neither can we see the
air.
If the air is cold, moisture does not rise rapidly; but, as the air
becomes heated, it takes up more moisture, so that the more heat there
is in the air, the more moisture rises.
Heated air is light, and rises higher and higher from the ground, taking
the moisture with it, until it reaches a point where it begins to cool.
Then as the air cools, the moisture forms into clouds, and these clouds
are, in a certain sense, floating water.
Floating water! How can water float! do you ask?
Well, I will tell you. Cold air is heavier than heated air, and until
the clouds become so full of moisture as to return some of it to the
earth, in the shape of rain, they float because they are lighter than
the air underneath them.
The winds, by the flapping of their mighty wings, drive the clouds over
the land to the hills and the mountains and the thirsty fields; and
there they pour their blessings on the farms, pastures, orchards, and
the dusty roads and way-side grass, bringing greenness and gladness
every-where.
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