What is asphalt on the road? .

Asphalt is an organic liquid that comes out of the ground and hardens after melting. Natural asphalt is made from the remains of marine organisms that die in the subsoil from the bottom of the sea. Asphalt, like natural oils, coal, etc., is stored for thousands of years by the earth's crust, and is brought to the surface by the movement of the earth's plates. In ancient times, in Babylon, Greece, Egypt, and Rome, asphalt was used to protect walls from rainwater. Canada has large reserves of asphalt. Asphalt is also obtained from natural oils. Asphalt is a sulfuric and odorless substance. It also contains a small amount of metals. Asphalt has been used not only to build roads but also to waterproof the wooden wings of ships.