Of the great current circuits in the world ocean, there are ________ in the Northern Hemisphere and ________ in the Southern
a. 4; 2
b. 2; 4
c. 3; 3
d. 6; 6
b
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Acid mine drainage occurs when ____.
A. mines use acid to clean equipment B. acid is used to remove rare earth minerals from mines C. acid is used to detect low grade mineral ores D. naturally occurring acids are uncovered during the mining process E. rainwater seeps through an underground mine spoils pile and produces sulfuric acid
World oil supplies and prices are expected to be controlled long-term by
a. OPEC b. the United States c. Mexico d. Russia e. Saudi Arabia
Rossby waves:
A) usually move from west to east. B) usually occur in Difficulty: Global sets of ten or more. C) change little from season to season. D) tend to reinforce normal weather patterns at middle latitudes.
Earth formed ____________________ billion years ago
Fill in the blank(s) with correct word