The Waterways Experiment Station was designed to study the causes of tornadoes improve transportation methods to rivers simulate the conditions that produce hurricanes test new technologies to better manage floods.

i do believe that the correct answer is   (technical reasoning); luck

explanation:

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices

answer; observing;