This bingo card has a free space and 8 words: How are skyscrapers created and what keeps them standing tall?, As the drawing shows, columns of concrete, or of concrete reinforced with steel, are stuck into bedrock beneath the building., If the layer of rock isn't present, these columns are sunk into a thick concrete pad spread across the bottom of a deep basement, Chicago, nearly destroyed by fire in 1871, was later rebuilt with innovative designs., This method of building, first developed in the United States, is used now in many other places in the world., The first skyscraper constructed on a metal frame was built there during this time period., Architects, using the latest materials, were glad to design in new ways. and Chicago, known as the site of the original 10 story skyscraper, now is home to the 110-story Sears Tower..
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