What is the main importance of the Ogallala aquifer?
A. It feeds springs for the largest trout farms in the world.
B. It is an important source of coal and hydroelectric power.
C. It is an important source of irrigation.
D. Radioactive waste has been buried along the eastern side and is leaking.
Answer: C
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What is true of the intertropical convergence zone?
a. It coincides with the geographical equator. b. It is the result of the convergence of a Hadley cell and Ferrel cell. c. It is subject to seasonal variations. d. It coincides with areas of strong winds.
e. It coincides with the horse latitudes.What is the term used to describe a shallow, partially enclosed area where freshwater enters the ocean?
A. coral reef B. mangrove swamp C. estuary D. abyssal ecosystem
Organic matter accumulated from grassland vegetation has played a major role in creating the fertile soils of the central U.S
True False Indicate whether the statement is true or false
Loess deposits in the U.S. Midwest are derived from ________.
A. top soil loosened by agriculture B. the Sahara Desert C. glacial outwash of the Pleistocene age D. the Ohio River valley E. the Rocky Mountains