Environmental Science
Where cold surface air replaces warm air, the boundary separating the different bodies of air is:

A tornado
A cold front
A parallel of latitude
A warm front

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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
The noon sun is overhead at 23.5o S latitude
All of these

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