Which phrase describes air density?
As altitude increases, what happens to air pressure?
Which describes one of oxygen's roles in Earth’s atmosphere?
Which phrase describes density?
Which atmospheric layer prevents meteoroids from reaching Earth’s surface?
Which atmospheric layer gets warmer as altitude increases and contains the ozone layer?
Which gas in Earth’s atmosphere forms ozone?
Which correctly lists three characteristics that are used to describe air?
Which gas in Earth’s atmosphere helps living things make proteins?
Which gas is most abundant in Earth’s atmosphere?
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