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When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants (either sand or aluminium oxide) hold the fractures open. Hydraulic fracturing began as an experiment in 1947, and the first commercially successful application followed in 1950.
Oil shale was one of the first sources of mineral oil used by humans. Its earliest recorded use was in Switzerland and Austria in the early 14th century. In 1596, the personal physician of Frederick I, Duke of Wuerttemberg wÃ¼rttemberg wrote of its healing. Properties shale oil was used to light the streets Of, Modena italy at the turn of the 17th. century