Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear lighter in color than is actually the case
Appear closer together than is actually the case
Appear to have more vertical development than is actually the case
Appear farther apart than is actually the case

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Environmental Science
An important reason for the large daily temperature range over deserts is:

Dry air is a very poor heat conductor
The light-colored sand radiates heat very rapidly at night
The ozone content of desert air is very low
Free convection cells are unable to form above the hot desert ground
There is little water vapor in the air to absorb and re-radiate infrared radiation

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