CFCs (chlorofluorocarbons) are gases that occur naturally in the atmosphere.
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Q13: The environmental lapse rate in the troposphere
Q14: The tropopause is higher above Earth's surface
Q15: Nitrogen molecules in the atmosphere are a
Q16: Northern lights occur in the mesosphere.
Q18: Methane is a greenhouse gas.
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Q20: Nitrous oxide is a greenhouse gas.
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Q22: The aurora occur because Earth's magnetic field
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