The highest mountain range in Russia is:
A) Urals
B) Balkans
C) Caucasus
D) Pamirs
E) Tien Shan
Answer: C
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Which surface water pollutant cannot be broken down or removed by natural processes?
A. arsenic B. oxygen-demanding C. bacteria D. oil
The power dissipated in a 4-ohm resistor carrying 3 A is
A. 36 W. B. 48 W. C. 18 W. D. 7 W.
Most of the deep-sea primary productivity results from ______ Fill in the blank(s) with the appropriate word(s)
Which of the following statements is true?
A. Humans may have been causing extinctions for thousands of years, but our impact has recently increased. B. Humans have never had significant impact on species extinctions until the past four decades. C. Humans are responsible for many of the mass extinctions in the geologic record. D. Humans only began causing extinctions in the past 150 years.