Is there a picture? What side did they work on?
Answer:
His steel empire produced the raw materials that built the physical infrastructure of the United States. He was a catalyst in America's participation in the Industrial Revolution, as he produced the steel to make machinery and transportation possible throughout the nation
Built a porotion of the great wall?
False (most of them came over because of the Irish potato famine and the German Depression)
Answer: A) X-Ray
Explanation: An X-ray would be a transverse wave, which travels at the speed of light. The other examples are all longitudinal, compression waves.
