Because tower bridges have a big base
THE Tower Bridge is in London.
The Eiffel is very stable because Gustave Alexandre Eiffel who built it used many well thought out structural members to support the body and shape of the iron tower!!!
It is built 5 storeys into the ground and it is shaped as a Y I supper smaart
Tower Bridge was built in 1894
with metal
the cements,bricks and glasses makes bridges towers strong
200 feet
London
A completley filled out electron level makes the atom stable
Truss bridges are made up of triangles which are quite stable since all loads are carried mostly in tension/compression and not bending. Long members may not be stablebecause of buckling in compression, butt most truss designs will account for that.
That the bridge has to allow tall ships down the river.
Tower Bridge