Air/atmosphere, a mixture of gaseous elements and compounds that surrounds Earth, Nitrogen, 78% of the Earth's atmosphere, Oxygen, 21% of the Earth's atmosphere, Argon, Helium, Neon, and Krypton, 1% of Earth's atmosphere, Dust, smoke, salt, pollen, and other chemicals, particles found in Earth's atmosphere, Earth's atmosphere is dynamic, meaning it..., is constantly changing, Density, the amount of mass in a given volume of air, As altitude increases, density..., decreases, A barometer measures..., air pressure, Humidity, the amount of moisture (water vapor) in the air, When air pressure is low, density is..., low, When air pressure is medium, density is..., medium, When air pressure is high, density is..., high

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