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Today, 09:11

Which of the following triggered the second industrial revolution?

A. Geologists discovered vast quantities of petroleum in germany

B. Entrepreneurs figured out how to extract coal much more efficiently

C. Innovators figured out how to produce steel cheaply

D. Engineers developed a much faster steam engine

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Answers (1)
  1. Today, 10:33
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    I think its:

    C. Innovators figured out how to produce steel cheaply
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