Troposphere - Which layer of the atmosphere contains most of the atmosphere's water vapor?, Stratosphere -  Which layer is home to the ozone layer, which absorbs harmful ultraviolet (UV) radiation from the sun?, Mesosphere - Which layer is the coldest layer of the atmosphere?, Mesosphere - Which layer is where most meteors burn up due to friction with the atmosphere?, Thermosphere -  Which layer is where the aurora borealis (northern lights) and aurora australis (southern lights) occur?,

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