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I IntroductionA The History of CarbonII Occurrences in NatureA DiamondB GraphiteC Coal and CharcoalD Amorphous CarbonIII Carbon CompoundsA InorganicB OrganicIV The Carbon CycleIV ConclusionCarbon an element discovered before history itself is one of themost abundant elements in the universe It can be found in the sun thestars comets and the atmospheres of most planets There are close to tenmillion known carbon compounds many thousands of which are vital to thebasis of life itself WWW 1Carbon occurs in many forms in nature One of its purest forms isdiamond Diamond is the hardest substance known on earth Althoughdiamonds found in nature are colorless and transparent when combined withother elements its color can range from pastels to black Diamond is apoor conductor of heat and electricity Until 1955 the only sources ofdiamond were found in deposits of volcanic origin Since then scientistshave found ways to make diamond from graphite and other syntheticmaterials Diamonds of true gem quality are not made in this way Beggott3-4Graphite is another form of carbon It occurs as a mineral innature but it can be made artificially from amorphous carbon One of themain uses for graphite is for its lubricating qualities Another is forthe lead in pencils Graphite is used as a heat resistant material andan electricity conductor It is also used in nuclear reactors as alubricator Kinoshita 119-127Amorphous carbon is a deep black powder that occurs in nature as acomponent of coal It may be obtained artificially from almost any organicsubstance by heating the substance to very high temperatures without airUsing this method coke is produced from coal and charcoal is producedfrom wood Amorphous carbon is the most reactive form of carbon Becauseamorphous carbon burns easily in air it is used as a combustion fuel Themost important uses for amorphous carbon are as a filler for rubber and asa black pigment in paint WWW 2There are two kinds of carbon compounds The first is inorganicInorganic compounds are binary compounds of carbon with metals
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