Environmental Science
"A good absorber of a given wavelength of radiation is also a good emitter of that wavelength." This is a statement of:

The First Law of Thermodynamics
Wien's Law
Stefan-Boltzmann's law
Kirchoff's Law
The Law of Relativity

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Environmental Science
During an equinox:

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

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