Environmental Science
The primary cause of a radiation inversion is:

Infrared radiation absorbed by the earth's surface
Solar radiation absorbed by the earth's surface
Infrared radiation emitted by the earth's surface
Infrared radiation absorbed by the atmosphere and clouds
Solar radiation reflected by the earth's surface

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Receive less sunlight during a year than the south-facing side
All of these
Have snow on the ground for a longer period of time in winter compared to the south-facing side
Be a better location for a ski run than the south-facing side
Grow a variety of trees that are typically observed at higher elevation

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