Environmental Science
During the winter solstice in the Northern Hemisphere:

At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
The noon sun is overhead at 23.5o S latitude
All of these
Astronomical winter begins in the Northern Hemisphere

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Environmental Science
Thermal belts are:

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

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