Most car shells are made from pressed steel, some are made from plastics.
Conch shells, like most all shells, are formed biologically by gastropods. The process happens through the absorption of calcium carbonate from seawater.
I believe the shells are made of chitin.
There are various boats used in the Olympics but I think what you are looking for is racing shells. The long skinny rowboats that have anywhere from one to eight rowers are called shells.
tiny broken down pieces of rock and sea shells
Shells are grown by shellfish to cover their insides.
Platform Racing 2 was made on April 2008
it's made of a certain amont of bug shells and hard plastic
NO . Turtles shells are natural and grow with the turtle. Plastic is man made .
Shells .......
Roman chariots had a duel purpose. Chariot racing was a big sport in ancient Rome, thus chariots were made for the purpose of racing. The military had use for chariots to travel to various destinations in the empire.
They are made an animal that lives in the sea.