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shale Definition

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shale
noun(shale)
a fissile rock that is formed by the consolidation of clay, mud, or silt, has a finely stratified or laminated structure, and is composed of minerals essentially unaltered since deposition
shale
noun(shale)
a crude dark oil obtained from oil shale by heating
shale
noun(shale)
a rock (such as shale) from which oil can be recovered by distillation

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