what makes oxygen

what makes oxygen

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The following is taken from http://www.wisegeek...m/what-is-oxygen.htm
jon.ellis
27 May 2012
Oxygen is a colorless, odorless, tasteless gaseous chemical element which appears in great abundance on Earth, trapped by the atmosphere. Many people are familiar with oxygen, because it is a vital component of the respiration process; without oxygen, most organisms will die within minutes. A number of forms of oxygen and oxygen compounds can be found in nature. Oxygen can also be isolated and sold in pure form for an assortment of uses, and was first isolated and identified in 1774. The atomic number of oxygen is eight, and it is identified by an O symbol on the periodic table of elements. In addition to being very widely distributed on Earth, oxygen is also the third most abundant element in the universe, and it is a key catalyst in many chemical reactions. Oxidation is one such reaction, and it occurs when oxygen mixes with other elements and compounds. Oxygen also plays a role in combustion. There are several ways to extract pure oxygen. Water can be ionized, forcing the oxygen and hydrogen atoms to separate. More commonly, however, samples of air are cooled into a liquid form and then slowly heated. As the air heats, elements precipitate out in a process called fractional distillation, because different gaseous elements convert to a gas form at different temperatures. Once extracted, the oxygen can be bottled for use.
jon.ellis
27 May 2012
A simple and obvious answer would be plants. Plants conduct a process called 'photosynthesis' which transforms carbon dioxide and water into oxygen and sugar.
Jamie F.
28 May 2012
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