Environmental Science
The slow rate of decomposition of fallen logs in nature is due to their

low cellulose content
low moisture content
anaerobic environment around them
poor nitrogen content

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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 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
The light-colored sand radiates heat very rapidly at night

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