Oil and gas are found in shale rock formations, such as Bakken, in areas of North Dakota that are part of the Williston Basin. The rock formations also contain saltwater. It is necessary to fracture and crack the rock formations to get to the oil and gas. Under high pressure the rock formations will crack, and sands are added to fill in the fractures, which allows the oil to filter into the horizontally drilled hole and be pumped to the

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