The agricultural industry in the Great Plains experienced the combination of drought and financial depression in the 1890s and again in the 1930s. This pattern is called what?
A) A dust-bowl economy.
B) The economic cycle.
C) A boom-bust economy.
D) The forty-year cycle.
C
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On this graph of discharge versus season for a river in the Rocky Mountains, why is the highest runoff likely to be in the spring?
A) Winter snow melts in the spring.
B) The Rocky Mountains have many tornadoes during the spring.
C) The Rocky Mountains experience hurricanes in the spring.
D) All of these are correct.
Water molecules join and leave the molecules of another substance without changing that substance's fundamental chemical formula in the process of:
a. oxidation. b. hydrolysis. c. hydration. d. evaporation. e. carbonation.
The time period for the Little Ice Age was
a. 10,000 years ago. b. from 1800 to present. c. from approximately A.D. 1500 into the early 19th century. d. at the beginning of the Pleistocene. e. none of the above
All levees are man-made. Indicate whether the statement is true or false