Persistent pollutants tend to accumulate in polar regions because
A. they are more stable at lower temperatures.
B. ionic effects move them toward the poles.
C. they evaporate in warm areas and condense in cold areas.
D. there are no crops to absorb them there.
Answer: C
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A. plutonic rock. B. a pluton. C. intrusive igneous rock. D. all of the above
High-crowned, abrasion-resistant chewing teeth are characteristic of ____________________, which eat
____________________. Fill in the blank(s) with the appropriate word(s).
A sedimentary deposit that contains fragments of oyster shells is most likely
a. continental. b. transitional. c. marine
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