Environmental Science
Biogas is composed of

methane, carbon dioxide, nitrogen and sulphur
methane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen
ethane, carbon dioxide, nitrogen and hydrogen

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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
The light-colored sand radiates heat very rapidly at night
Free convection cells are unable to form above the hot desert ground
The ozone content of desert air is very low
Dry air is a very poor heat conductor

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