Environmental Science
Most of the radiation emitted by a human body is in the form of:

Visible radiation but is too weak to be visible
Humans do not emit electromagnetic radiation
Ultraviolet radiation and is invisible
Infrared radiation and is invisible

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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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