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Aluminum warrants special mention because it is the most abundant metal and the third most abundant element in the Earth's crust; [3] despite this, it is not essential for life. With this sole exception, the eight most highly abundant elements in the Earth's crust , making up over 90% of the crustal mass, [ 3 ] are also essential for life.
Various metals, together with oxygen, can form very complex and thermally stable structures rivaling those of organic compounds; [citation needed] the heteropoly acids are one such family. Some metal oxides are also similar to carbon in their ability to form both nanotube structures and diamond-like crystals (such as cubic zirconia ).
Organic molecules can also be made by chemical reactions that do not involve life. [2] Basic structures are created from cellulose, tannin, cutin, and lignin, along with other various proteins, lipids, and carbohydrates. Organic matter is very important in the movement of nutrients in the environment and plays a role in water retention on the ...
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Organic molecules on the early Earth could have had either terrestrial origins, with organic molecule synthesis driven by impact shocks or by other energy sources, such as ultraviolet light, redox coupling, or electrical discharges; or extraterrestrial origins (pseudo-panspermia), with organic molecules formed in interstellar dust clouds ...
Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive. [ 1 ] Although organic compounds make up only a small percentage of Earth's crust , they are of central importance because all known life is based on ...
Though dismal, there are reasons organic produce is dreadfully more expensive than conventional produce. The price hike ties to the fact that organic requires greater labor efforts than non-organic.