Environmental Science
Warming in the stratosphere is mainly caused by:

Absorption of ultraviolet radiation by ozone
Release of latent heat energy during condensation
Frictional heating caused by meteorites
Chemical reactions between ozone and chlorofluorocarbons

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Environmental Science
During an equinox:

All of these
The days and nights are of equal length except at the poles
At noon the sun is overhead at the equator
The earth is not tilted toward nor away from the sun

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