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oxygen
Periodic Table of Elements: Los Alamos National Laboratory.
Oxygen under excited conditions is responsible for the bright red and yellow-green colors of the Aurora Borealis. A gaseous element, oxygen forms 21% of the atmosphere by volume and is obtained by liquefaction and fractional distillation. The atmosphere of Mars contains about 0.15% oxygen.
The Origin of Oxygen in Earth's' Atmosphere Scientific American.
Climate, volcanism, plate tectonics all played a key role in regulating the oxygen level during various time periods. Yet no one has come up with a rock-solid test to determine the precise oxygen content of the atmosphere at any given time from the geologic record.
Oxygen.
Mayow observed that: substances do not burn in air from which oxygen is absent; oxygen is present in the acid part of potassium nitrate i.e, in the nitrate he was right; animals absorb oxygen into their blood when they breathe; air breathed out by animals has less oxygen in it than fresh air.
How much do oceans add to world's' oxygen? Earth EarthSky.
By the way, by about 400 million years ago, scientists say, enough oxygen had accumulated in Earths atmosphere for the evolution of air-breathing land animals. But free oxygen by itself wasnt enough. Another form of oxygen was also essential: the build-up of a special kind of oxygen at the top of Earths atmosphere.
Oxygen Official Site.
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oxygen lighting.
Oxygen No Man's' Sky Wiki.
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Oxygen from photosynthetic microbes eventually built up in the atmosphere, drastically changing our planet's' environment and the history of life in the process. Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things.
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Facts About Oxygen Live Science.
Hooray for oxygen, the element that keeps much of life on Earth humming. 8 on the Periodic Table of the Elements is a colorless gas that makes up 21 percent of Earth's' atmosphere. Because it's' all around, oxygen is easy to dismiss as dull and inert; in fact, it's' the most reactive of the non-metallic elements.
Oxygen Forensics Mobile forensic solutions: software and hardware.
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