stone and granite
boggies
elbow
we use wood for make bridge strong
They didn't make watches,the made sundials,and they were probably made of rock or clay.
Use Flint (chert) and any kind of steel (knife, rebar, tent stake)
triangleANS 2 - There is no 'best shape' - each bridge is designed for a particular place and can be almost any kind of construction.
granite
The current London Bridge in London is a pre-stressed concrete box girder bridge.
Steel and stone.
a rock knif
go to the cave next to that one thing that's next to the one thing that's next to the other by the tree on the bridge use use use use rock rock rock smash then die hope i helpped
they would use a rock to chip away at another rock to make one rock sharp