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Many bridges survive earthquakes. Most earthquakes are small or moderate and do very little damage.
The Golden Gate Bridge.
Vincent Thomas Bridge, San Pedro California
A span on a bridge is the distance between supports such as from pier to pier. A bridge can have several supports over its length. A bridge length includes the entire bridge.
The Brooklyn bridge was designed by John Roebling and the Roeblings helped in the process of building the bridge with many other workers.