Environmental Science
At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between:

200 and 6,500 feet
23,000 and 43,000 feet
Above 43,000 feet
6,500 and 23,000 feet

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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
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
The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night

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