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USGS CMG InfoBank: Depth and Pressure

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Comment: 19:00 - 19:45 (00:45)
Source: Annenberg/CPB Resources - Earth Revealed - 12. Minerals: The Materials of Earth
Keywords: "J. Lawford Anderson", "covalent bond", carbon, atom, diamond, graphite, "layered crystal structure", pressure, depth, mantle

Our transcription: The covalent bond gives a strongly interlocking atomic arrangement to the carbon atoms in diamond.
The weak bonds of carbon in graphite, however, develop a layered crystal structure.
Graphite is formed under low pressure conditions near surface, while diamond is formed under tremendously high pressures, in fact, needs great depths in the Earth to form; depth that are well within the mantle.
It is these depths and pressures that give a diamond its covalent bonding and dazzling beauty and make it the rare and sought after jewel it has been throughout history.

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