Environmental Science
How much radiant energy will an object emit if its temperature is at absolute zero?

The maximum theoretical amount
None
Depends on the chemical composition of the object
The same as it would at any other temperature

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

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

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