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Bitumen. Bitumen is a brown to black semi-solid highly viscous form of petroleum. It is present in some natural deposits, such as asphalt lakes, but c
Bitumen. Bitumen is a brown to black semi-solid highly viscous form of petroleum. It is present in some natural deposits, such as asphalt lakes, but can also be a product of refining. It's primary use is in road-surfacing and roofing material where it is mixed with gravel.
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