Iron+&+Steel

Iron is really heavy and its not as cheap as you would hope. Its advantages are that it can mold to any shape and when it is compressed it holds strong. But iron also has disadvantages, for example, it is weaker than steel in tension and it breaks without warning. It was often used in arch bridges, cannons and historic domes.

If you compare steel and iron, you will come to the conclusion that they both have the same price but that steel is a little bit heavier than iron. The main advantage of using steel is that it is one of the strongest materials used in construction, therefore, it is strong in tension and compression. Among its disadvantages are that it rusts and in extremely high temperatures it looses strength. Steel is often used in trusses, cables in suspension bridges, roller coasters, and, beams and columns in skyscrapers.

Around my dwelling are five buildings that are all made of pure __brick__. There are more than 10 __columns__ in my aunt house. My dad taught me all there is to know about __wire__ and its uses. He __fused__ all the construction materials that we threw away. I am so strong I can __bend__ a piece of __steel__ all by myself. media type="file" key="sentences augusto.mp3" On your wiki, write your opinion about this quotation from the recording: “the old cast iron buildings died out. I'm not really sure whether the new skyscrapers killed them, or the new esthetics”

From the recording, I realized that stone was often used for many constructions, but then when the cast iron started to get popular, since it produced more illumination and it was lighter, people all over the US started to make constructions which used cast iron as their main construction material. This was to "catch up" with Europe since they have been constructing with iron for more time. Most of this constructions were decorated with different sculptures, and after a huge fire, people started to use modern steel for their constructions which left cast iron in the past. After this is when we can understand the quotation; so cast iron did not really died (since it was never "alive") but people forgot about it and John Lienhard doesn't know if that happened because people wanted to build higher buildings or if it was because people didn't like any more how cast iron look on a facade.

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