In the saturated zone of an unconfined aquifer, groundwater always flows ____.
A. from areas where the water table is low to areas where the water table is high
B. toward stream beds
C. from areas where the water table is high to areas where the water table is low
D. away from stream beds
E. from the poles toward the equator
Ans: C. from areas where the water table is high to areas where the water table is low
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America's largest estuary, the ____________________, has greatly reduced shellfish and fisheries harvests due to a high population, nonpoint source pollution, and the resulting eutrophication.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements gives an important reason for the large daily temperature range over deserts?
A. Free convection cells are unable to form above the hot desert ground. B. Dry air is a very poor heat conductor. C. There is little water vapour in the air to absorb and re-radiate infrared radiation. D. The light coloured sand radiates heat very rapidly at night.
What is the source of the power supply used in the New York and Mohawk River Valley manufacturing area?
A) locally mined coal B) nuclear energy C) Niagara Falls D) solar energy and wind farms E) natural gas
Woody shrubs (called chaparral or maquis) and widely spaced, stunted trees with occasional patches of bunchgrass are the dominant vegetation types in:
a. tropical rainforest and tropical savanna borders b. humid continental climates c. desert climates d. Mediterranean climates