Concrete is a composite material composed mainly of water, cement and rocks. Concrete is used for the construction of structures such as the Panama Canal and also roads for automobile traffic.
Gateview Prison was made of concrete and stainless steel.
Superman used a concrete highway to dam up the Ocean City River before the flames caused by the Lava Men reached the open sea.
- ↑ As seen in the 1981 episode The Lava Men.
- ↑ According to the narrator in The Menace of the White Dwarf.
- ↑ As seen in The Lava Men.