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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.
A portion of the contaminated oil was discharged directly intothe environment and caused environmental pollution (17).DDT was first used in Vietnam to combat malaria in 1949. The quantity of DDT used, however,was 315 tons in 1961 and decreased to just 22 tons in 1974.