Unpaved road
Videos
An unpaved road is a type of road whose surface has not been sealed with a pavement treatment, such as concrete or bitumen. An unpaved road can be a dirt road, whose surface is the native material of
A paved road in Switzerland transitioning to a gravel track
Logging road near Eséka in Cameroon
A primitive road near Buwenda, Uganda
Gravel track in Spain
Bitumen
Videos
Bitumen is an immensely viscous constituent of petroleum. Depending on its exact composition, it can be a sticky, black liquid or an apparently solid mass that behaves as a liquid over very large time
Unpaved road
…An unpaved road is a type of road whose surface has not been sealed with a pavement treatment, such as concrete or bitumen. An unpaved road can be a dirt road, whose surface is the native material of the land surface (known as subgrade material), or it could be a gravel…
Natural bitumen from the Dead Sea
Refined bitumen
The University of Queensland pitch drop experiment, demonstrating the viscosity of bitumen
Bituminous outcrop of the Puy de la Poix, Clermont-Ferrand, France