EarthYP Edge Conference in Maui, Hawaii

217 10th St S
Kirkland, WA 98033
(425) 827-5513

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221 10th St S
Kirkland, WA 98033
(425) 827-0710

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Atmosphere of Earth
From Wikipedia, the free encyclopedia
The atmosphere of Earth, commonly known as air, is the layer of gases retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation). By mole fraction (i.e., by number of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere. Air composition, temperature, and atmospheric pressure vary with altitude.
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EarthYP Edge Conference in Maui, Hawaii