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These two forms have identical physical properties but different crystal structures.
It is produced in the upper atmosphere by radiation from the sun.
Carbon is most commonly obtained from coal deposits, although it usually must be processed into a form suitable for commercial use.
This black soot, also known as lampblack, gas black, channel black or carbon black, is used to make inks, paints and rubber products.
Diamonds and graphite are pure forms, and carbon is a major constituent of coal, petroleum, and natural gas.
Carbon generally forms four covalent bonds with other atoms in larger molecules.
An important factor in decision-making is how quickly the results are reported, particularly if there are deadlines to meet.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source A nonmetallic element occuring in many inorganic and in all organic compounds, existing as graphite and diamond and as a constituent of coal, limestone, and petroleum, and capable of chemical self-bonding to form a number of important molecules.