Environmental Science
During the afternoon the greatest temperature difference between the surface air and the air several meters above occurs on a:

Cloudy, windy afternoon
Cloudy, calm afternoon
Clear, calm afternoon
Clear, windy afternoon

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Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins 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

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