Iron+&+Steel

 **For their resistance and their easiness of mixing with cement, steel is used a lot of time as material for the buildings structure and other constructions the same as the iron. Besides sometimes are used for decoration. **
 * Iron & Steel **

**Iron can be model to any form, it is strong in compression and it is weaker than steel in tension. It is used in structures as bridges arches and cannons. **

** Steel is strong in tension and compression and it is one of the strongest materials used as structural support in the constructions like the Eiffel Tower, the skyscraper like the Empire State Building and the Chrysler Building. ** media type="file" key="empire state 2.wma" width="336" height="28" align="center"