caterpillar
Railroad tracks are made from steel.
they do not move because it is just the tank moving I think I might be wrong...
Bmx tracks are made of mostly lime and gravel
Twenty wheels connectd to the tracks.
The tank tracks allows the very heavy tank to move over uneven and soft ground. The tracks spreads the weight of the tank over a longer distance. Ground that wheeled vehicles would soon become bogged down and unable to move forward.
They're called Tracks
Tracks on tanks showed up in ww1 to allow them to cross trenches without getting stuck, America was the first to deploy them.
Concrete or asphalt depending on the track.
The weight of the tank is distributed over a large area, exerting less pressure on the ground. Hence, the army tanks run on tracks.
Wheels might get shot out and tracks make it easier for the tank to go over rough land
by a snowmobile