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Earth`s Major Spheres The view of Earth shown in
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EarthFormationPwrPT
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... Just formed Earth: Like Earth, the hydrogen (H2) and helium (He) were very warm. These molecules of gas moved so fast they escaped Earth's gravity and eventually all drifted off into space. 1. Earth’s original atmosphere was probably just hydrogen and helium, because these were the main gases in th ...
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... Evaporation: Water turns from liquid to gas. Condensation: Water turns from gas to liquid Dew: moisture condensed from the atmosphere, esp. at night, and deposited in the form of small drops upon any cool surface. Dew Point: The temperature to which air must be cooled for saturation to occur. Sling ...
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layer of the atmosphere in which weather occurs and we have direct
layer of the atmosphere in which weather occurs and we have direct

... troposphere: layer of the atmosphere in which weather occurs and we have direct contact with stratosphere: layer of the atmosphere above the troposphere containing naturally occurring ozone thermosphere: layer of the atmosphere above the mesosphere mesosphere: layer of atmosphere above the stratosph ...
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Atmosphere of Earth



The atmosphere of Earth is the layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).The common name air is given to the atmospheric gases used in breathing and photosynthesis. By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% 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 content and atmospheric pressure vary at different layers, and air suitable for the survival of terrestrial plants and terrestrial animals is found only in Earth's troposphere and artificial atmospheres.The atmosphere has a mass of about 5.15×1018 kg, three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. The Kármán line, at 100 km (62 mi), or 1.57% of Earth's radius, is often used as the border between the atmosphere and outer space. Atmospheric effects become noticeable during atmospheric reentry of spacecraft at an altitude of around 120 km (75 mi). Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition.The study of Earth's atmosphere and its processes is called atmospheric science (aerology). Early pioneers in the field include Léon Teisserenc de Bort and Richard Assmann.
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