Environmental Science
The main reason(s) for warm summers in northern middle latitudes is that:

The earth is closer to the sun in summer
The days are longer
The sun is higher in the sky and we receive more direct solar radiation
Only (b) and (c) are correct
All of these

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Environmental Science
Thermal belts are:

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

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