Environmental Science
The most abundant greenhouse gas in the earth's atmosphere:

Water vapour (H2O)
Chlorofluorocarbons (CFCs)
Nitrous oxide (N2O)
Carbon dioxide (CO2)
Methane (CH4)

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Environmental Science
Thermal belts are:

Cold, below-freezing air found at the top of a mountain
Warmer hillsides that are less likely to experience freezing conditions
Pockets of cold air resting on a valley floor at night
Pockets of warm air resting on a valley during the afternoon

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