What were the two major causes of the dust bowl during the early 1930s

Which areas where seperated by the iron curtain

Which of the following accurately describes the workforces of the united states and canada? a. most of the workforce in the united states and canada is employed in the service industry. b. most of the workforce in the united states and canada is employed in the educational field. c. most of the workforce in the united states and canada is employed in manufacturing and mining. d. most of the workforce in the united states and canada is employed in agriculture.

Which agency is under the authority of the department of labor? sec osha epa fda