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Less solar radiation reaches Earth's surface at higher latitudes, in part because it must pass through more of the atmosphere.
In what way does the atmosphere interfere with insolation?
Energy is reflected, absorbed, and scattered by atmospheric gases.
Energy can only be reflected by atmospheric gases.
Energy can be reflected or scattered by atmospheric gases, but absorption would increase insulation by Earth's surface.
Energy can only be reflected or refracted by atmospheric gases.
Energy is lost to space due to the additional time required to pass through more of Earth's atmosphere.