Bridges

Bridges A very important characteristic of the humans is the capacity to create new tools to make better their lives. A relevant example is the bridge. A bridge is a resource that is used to reach from side to another side more easily and in less time. Also it can be used to solve obstacles like rivers and valleys. The bridges represent an advantage because it do more comfortable and fast the travel since a place to another. However a disadvantage of the bridges is that their bases create obstacles in some places.

There are some kinds of bridges. The most important differences between the kinds of bridges are the size of the obstacle and the distance from one side to the other. The 3 basic types of bridges are the beam bridge, the arch bridge and the suspension bridge. The beam bridge can save a distance of 60 meters. The arch bridge solves distances below the 300 meters. Finally a suspension bridge can save distances of 2100 meters.

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The bridges can be made of different materials but the principals are stone, brick, steel, iron and concrete. You can see examples like the Roman Bridge of Cordoba, a stone bridge and the Golden Gate, a steel bridge. Finally I can say that the bridges are a grate creation of the humans because affect in a good way the life of the persons, making their lives more comfortable. The bridges are excellent tools that the people can use everyday.

@http://www.makingthemodernworld.org.uk/learning_modules/maths/02.TU.03/?section=1 @http://science.howstuffworks.com/engineering/civil/bridge1.htm www.nireland.com/bridgeman/Bridging%20Materials.htm