Environmental Science
The most abundant gas in the stratosphere is:

Carbon dioxide (CO2)
Ozone (O3)
Nitrogen (N2)
Chlorofluorocarbons (CFCs)
Oxygen (O2)

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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
All of these
The noon sun is overhead at 23.5o S latitude
Astronomical winter begins in the Northern Hemisphere

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