Environmental Science
In July, at middle latitudes in the Northern Hemisphere, the day is ____ long and is ____ with each passing day.

More than 12 hours; getting shorter
Less than 12 hours; getting shorter
Less than 12 hours; getting longer
More than 12 hours; getting longer

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Environmental Science
At night, low clouds:

Are often caused by the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect

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