Question

When coal gets metamorphosed into
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its price​

Answer 1

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What is coal metamorphosed into?

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Even coal can be metamorphosed; bituminous (soft) coal, a sedimentary rock, can be changed into anthracite, or hard coal. ... Different grades of metamorphism are demonstrated when a shale is subjected to increasingly greater pressure and heat - first it becomes slate, then phyllite, then schist, and finally, gneiss