Environmental Science
Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

None of these
About 21 percent
About 78 percent
Less than 4 percent
Close to 10 percent

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

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