I choose to do my research on submarines because I would like to know more about this. In my presentation I would like to talk about the history of submarines , their role in the Cold War and World War II ,how the submarines are build , characteristics , the life in the submarine and also the actual role of submarines.
I hope that everyone in the classroom will enjoy it.
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Skyscrapers
The term "skyscraper" was used in 1880; after the first tall buildings were build in the
Before there were towers made of heavy stone. Towers had thick walls and the rooms were dark and overcrowded. Windows weren’t very common, it could disadvantage the structure.
With the discovery of the steel begin the new era of modern skyscrapers. The
New structural designs made skyscrapers even lighter and stronger.
As skyscrapers get taller and taller, engineers were faced with a new problem: the wind. Today's tallest skyscrapers, which are almost 1,500 feet tall, must be 50 times stronger against wind than the typical 200-foot buildings of the 1940s.
New structural designs made skyscrapers even lighter and stronger. As skyscrapers get taller and taller, engineers were faced with a new problem: the wind. Today's tallest skyscrapers, which are almost 1,500 feet tall, must be 50 times stronger against wind than the typical 200-foot buildings of the 1940s.
Skyscrapers represent the big issue for the population explosion in our days. In my opinion skyscrapers is a good think because it permits to locate a big number of people in one place into the profit of green spaces that can be saved.
1 comment:
I like the historical story about WWII, Submarine is also very interesting.
have u watched U571 the movie?
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