sedimentary
Asphalt
Asphalt concrete
Black, sticky, highly viscous liquid or semi-solid form of petroleum mixed with aggregate (sand, gravel, crushed stone). Hardness varies with temperature.
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Physical properties
Black, sticky, highly viscous liquid or semi-solid form of petroleum mixed with aggregate (sand, gravel, crushed stone). Hardness varies with temperature.
Formation & geological history
Artificial mixture of bitumen (a petroleum product) and aggregates. Bitumen forms naturally from ancient organic matter, but asphalt concrete is manufactured.
Uses & applications
Extensively used in road construction, roofing, and waterproofing.
Geological facts
Also known as blacktop or tarmac in some regions. The La Brea Tar Pits in Los Angeles are a famous natural asphalt seep.
Field identification & locations
Identified by its black color, rough texture due to aggregate, and distinctive tar-like smell when heated. Common everywhere there are roads.
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