Answer:
US Chemical Safety & Hazard Investigation Board (CSB)
Explanation:
The U.S. Chemical Safety Board (CSB) is an independent, nonregulatory federal agency that investigates the root causes of major chemical incidents.
The CSB conducts root cause investigations of chemical incidents at fixed facilities.
1) A
2) A
3) D but I might be wrong
4) D
5) C
The construction indeed marked and changed many issues in the United States, being considered the greatest technological achievement of the nineteenth century. It was still necessary to link trade activities as well as travel between the US West and East to accelerate the economy, making the country one of the largest powers in the world afterwards.
In the later fifty the United States built several railroads, more than any other nation. By 1869 the line was completed and a journey made by horse for months and months was now possible in less than a week. Five days after the end of the road, it has started to operate daily passenger rail services. The comfort and quality of the ride was amazing and everyone was very surprised. Even the magazines gave enthusiastic accounts of the trip.
A. They were able to learn more and because smarter and more social. ( I believe )
