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Settling pond: man-made depression created to receive water and sand mixture directly from a dredging operation.
UNESCO: L O S S A R Y
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It extracts oil from the ground using a method called fracking - pumping down a mixture of sand, water and chemicals at high pressure.
BBC: US to become 'world's biggest oil producer'
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Under the process of fracking, oil or gas is extracted from shale rock by pumping a mixture of sand, water and chemicals into the rock at high pressure.
BBC: Shale will free US from oil imports, says ex-BP boss
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When that happens, and a sinkhole threat has been established, crews can pump a thick grout a mixture of sand and cement into the ground to fill the holes.
NPR: Work Continues, Future Uncertain For Sinkhole Site
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Oil sands are naturally occurring geologic formations that contain a mixture of water, sand, and bitumen.
FORBES: An Indian Consortium Shows Interest In ConocoPhillips' Alberta Oil Sands Assets
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The flight bans came amid fears that the ash - a mixture of glass, sand and rock particles - can seriously damage aircraft engines.
BBC: EU emergency talks called on volcanic ash air chaos
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In fracking, a mixture of water, sand and some chemicals is pumped into a well under high pressure to force the gas from the rock.
BBC: Gas fracking: Ministers approve shale gas extraction
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This year he completed what is believed to be the first ever fracture stimulation procedure in Turkey: injecting a mixture of water and sand at high pressure down the wells to break up rock and release gas.
FORBES: Magazine Article
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On reaching the shale, the mixture of water and fracking fluid bursts open the rock and the sand keeps the fractures open, allowing the gas to flow to the surface.
ECONOMIST: Fracking
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Where there is less sand they, like Mr Serrato, can mix it into the soil, but the mixture does not hold water so well.
ECONOMIST: Honduras and Nicaragua