Cloud

In meteorology, a cloud is a visible mass of liquid droplets or frozen crystals made of water or various chemicals suspended in the atmosphere above the surface of a planetary body. These suspended particles are also known as aerosols. Clouds in earth's atmosphere are studied in the cloud physics branch of meteorology. Two processes, possibly acting together, can lead to air becoming saturated; cooling the air or adding water vapor to the air. In general, precipitation will fall to the surface; an exception is virga, which evaporates before reaching the surface.

Famous quotes containing the word cloud:

“It cannot be denied that for a society which has to create scarcity to save its members from starvation, to whom abundance spells disaster, and to whom unlimited energy means unlimited power for war and destruction, there is an ominous cloud in the distance though at present it be no bigger than a man’s hand.”
—Arthur Stanley Eddington (1882–1944)

“A brush had left a crooked stroke
Of what was either cloud or smoke
From north to south across the blue;
A piercing little star was through.”
—Robert Frost (1874–1963)

“That which is given to see
At any moment is the residue, shadowed
In gold or emerging into the clear bluish haze
Of uncertainty. We come back to ourselves
Through the rubbish of cloud and tree-spattered pavement.
These days stand like vapor under the trees.”
—John Ashbery (b. 1927)