All of the following statements apply to ocean spreading centers, except ________.
A. they are the location of volcanism
B. they are typically shallower than surrounding abyssal plains
C. they are characterized by deep earthquakes
D. they are part of mid-ocean ridge systems
E. they are a divergent boundary
Answer: C
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Forms of an element having the same atomic number but different mass numbers are called
A. compounds. B. molecules. C. isotopes. D. nuclei. E. electrons.
The following three boxes represent the number of submicroscopic particles within a given volume of a particular substance at different temperatures. Which box represents the greatest density? Which box represents the greatest temperature? 
A. A and C B. B and A C. A and B D. B and C
Weather-producing fronts are parts of the storm systems called ____________________.
hurricanes tropical storms mid-latitude cyclones typhoons
In which of the following marine/aquatic ecosystems would one tend to find the highest net primary productivity?
A) open ocean B) boreal forest C) algal beds and reefs D) upwelling zone