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Short "hint"

n. - A sedimentary rock formed by the deposition of successive layers of clay.

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Usage examples (40)
  • I agree that getting oil from shale is not the answer.
  • The amount of water it takes to get that oil shale is pretty much all the water we have.
  • The shale is part of a 600-mile-long geological formation containing a huge reservoir of natural gas.
  • CVX and Statoil are reportedly interested in investing in Chinese shale as are a few very large American independents.
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