Steel and geometry, tension, straight, aches and channels make a good bridge
The supports that are under the bridge is very thick and strong which makes londen bridge strong.
It's arches.
The present London Bridge is a pre-stressed concrete box girder bridge which makes it very strong.
because it poops
They support their on weight.
the food they eat makes them strong
the shell shape makes it strong.
okay
it depends onthe science of gravity and stablization so the bridge can stand.
monkeys
it was made out of strong tools
big mussels can make horse strong