Bitumen
= Bitumen
{wiki=Bitumen}
Bitumen is a viscous, black, sticky substance that is primarily composed of hydrocarbons. It is naturally occurring and can be found in deposits, but it is also produced through the refining of crude oil. Bitumen is commonly used in road construction and maintenance as a key ingredient in asphalt, which is a mixture of bitumen and aggregates (such as sand and gravel).