What is the primary cause of oxygen depletion in the disphotic zone?
a. photosynthesis
b. chemosynthesis
c. primary production
d. buffering reactions
e. heterotrophic respiration
e
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The United States does not have significant monsoonal activity primarily because:
A) there is no major east-west mountain range in the southeastern United States. B) the Gulf of Mexico has moderately cool surface waters. C) winds tend to blow from the north in the summer. D) North America is smaller than Asia.
Since the turn of this century, CO2 in the atmosphere has:a
been increasing in concentration. b. been decreasing in concentration. c. remained at about the same concentration from year to year. d. disappeared entirely.
Which convection model suggests "sluggish flow" in the lower mantle?
A) layer cake B) slab pull C) whole mantle D) ridge push
Which of the following describes the basic way in which electricity is generated using the ocean thermal energy conversion technique, or OTEC?
A. temperature difference between the surface and deep ocean waters B. heat energy obtained from surface winds blowing across warm ocean waters C. convection cells within the ocean D. temperature difference between the incoming and outgoing tides E. the ocean's geothermal energy