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heavier asphalt. Bacterial action on the asphalt at low pressures creates petroleum in asphalt. The researchers indicated that extremophiles inhabited the asphalt lake in populations ranging between 10⁶ and 10⁷ cells/gram. The Pitch Lake is one of several natural asphalt lakes in the world, including La Brea Tar Pits (Los Angeles), the McKittrick Tar Pits

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