Environmental Science
Which of the following gases are mainly responsible for the atmospheric greenhouse effect in the earth's atmosphere?

Water vapor and carbon dioxide
Ozone and oxygen
Oxygen and nitrogen
Nitrogen and carbon dioxide

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

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

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