Which of these pH values corresponds to the most acidic rain?
A. 5.2
B. 4.9
C. 6.1
D. 5.8
E. 4.6
E
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If the path of polar wandering recorded on two continents is not the same, then we can say that
A. the continents have always been widely separated. B. our radioactive dating techniques have been inaccurate. C. Earth's magnetic history has been very complex. D. at least one of the continents has moved.
The World Meteorological Organization
A) is under the auspices of the European Union. B) has about 50 member nations. C) transmits its data from three regional centers. D) does not have any weather sensors for oceans.
Which type of biologically important molecules includes many cyclic hemiacetals?
A) carbohydrates B) lipids C) proteins D) none of these
Which of the following is TRUE regarding cloud-condensation nuclei?
A) Maritime air masses generally possess more nuclei per cubic meter than continental air masses. B) Continental air masses average about a billion nuclei per cubic meter. C) Continental air masses contain more than 10 times the condensation nuclei of maritime air masses. D) Condensation nuclei is rare in urban environments.