Environmental Science
The blueness of the sky is mainly due to:

Emission of blue light by the atmosphere
The presence of water vapor
The scattering of sunlight by air molecules
Absorption of blue light by the air

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Environmental Science
Thermal belts are:

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
Cold, below-freezing air found at the top of a mountain

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