Coal First Aid Contest Exam Taken from the 2013 National Coal First Aid Contest Rules Progress Indicator: Question 5 of 25 5.  The booms and busts of uranium mining fluctuated based on economic and political factors.  Which of the following events left the deepest impression on the field?  Need Help? Choices: the Iraq War in the early to mid-2000s the oil crisis of the 1970s the arms race between the Soviet Union and the United States, beginning in the 1950s