What gas is most abundant in Earth's atmosphere?, Helium, Carbon dioxide, Oxygen, Nitrogen, Which layer contains weather?, Stratosphere, Thermosphere, Troposphere, Mesosphere, What gas do humans need to breathe?, Oxygen, Methane, Hydrogen, Nitrogen, Which layer has the ozone layer?, Mesosphere, Stratosphere, Troposphere, Exosphere, What protects Earth from UV rays?, Air pressure, Water vapor, Ozone layer, Cloud cover, What causes air pressure?, Ocean waves, Sunlight only, Moonlight, Air weight, Which layer is coldest?, Mesosphere, Troposphere, Exosphere, Stratosphere, What instrument measures air pressure?, Hygrometer, Barometer, Thermometer, Anemometer, What is moving air called?, Fog, Wind, Rain, Dew, Which gas helps trap heat?, Neon, Argon, Carbon dioxide, Nitrogen

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