subways in america extreme engineering respond thoroughly to all six questions. 1 of 6 why might the subway…

subways in america extreme engineering respond thoroughly to all six questions. 1 of 6 why might the subway systems of large cities be called the “circulatory system” of the city? it was called the circulatory system because they transport people throughout the city. 2 of 6 what made drilling under new york city nearly impossible one hundred years ago? how has that changed? drilling under new york was impossible because the grain called schists was making it hard to drill through so they had to drill over it. now it was changed by 3 of 6 what is an immersed tunnel? how is it constructed? what obstacles does an immersed tunnel help tunnel builders overcome? an immersed tunnel is a type of underwater tunnel. it was constructed for trains to go underwater but it is on the water bed. the kind of obstacles the immersed tunnel helps tunnel builders overcome is 4 of 6 what is the “geometry train”? what does it do? why is it important to commuters? the “geometry train” is

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