asphalt
Asphalt Wikipedia. Asphalt, also known as bitumen (UK: / ˈ b ɪ tj ʊ m ɪ n /, US: / b ɪ ˈ tj uː m ə n, b aɪ/), is a sticky, black, and highly viscous liquid or semisolid form of may be found in natural deposits or may be a refined product, and is classed as a .