Which represents the amount of rivers in the world that are heavily polluted?
A. 1/2
B. 1/4
C. 3/4
D. All
Answer: A
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Equatorial upwelling occurs in what current?
a. Gulf Stream b. Brazil Current c. North Atlantic Current d. California Current e. South Equatorial Current
Nutrients tend to be liberated by decomposition of organic matter at depth and returned to the surface by the physical processes of vertical circulation.
Answer the following statement true (T) or false (F)
What kinds of rocks were most commonly retrieved from the lunar highlands?
A) Flood basalts B) Granite C) Anorthosite D) Frozen hydrogen
Which of the following is a valid statement with relevance to groundwater?
A. Fractures are the main way groundwater moves through some rocks, such as granite. B. Most groundwater occurs in caves and underground lakes. C. In most sediments, adjacent grains fit tightly together. D. None of these choices are correct.