Asphalt (US /ˈæsfɔːlt/, UK /ˈæsfælt/, occasionally /ˈæʃfɔːlt/), also known as bitumen (US /bɪˈtjuːmən, b-/, UK /ˈbɪtjᵿmən/) is a sticky, black and highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product; it is a substance classed as a pitch. Until the 20th century, the term asphaltum was also used. The word is derived from the Ancient Greek ἄσφαλτος ásphaltos. MORE
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