In HNLC regions, phytoplankton blooms are typically most limited by ________.
A. phosphorus
B. nitrogen
C. light
D. grazing
E. iron
Answer: E
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What is created due to the decomposition of falling biological debris and zooplankton activity?
A) Bioluminescence B) Oxygen minimum zone C) Compensation depth D) Disphotic zone
In the United States, if a person is concerned about an infectious disease such as the avian flu, the most reliable source of information would be the
A) United States Department of Human Health and Sciences. B) United States Department of Agriculture. C) National Academy of Sciences. D) Centers for Disease Control and Prevention.
In a sky filled with scattered cumulus humilis clouds, rising motions are found ____ the clouds and sinking motions are found ____ the clouds
a. between; above b. under; between c. under; under d. between; between e. above; under
What can changes in the composition of volcanic gases indicate?
A. Magma rising toward the surface B. Whether or not volcanic mudflows can occur C. Where valuable mineral resources are located D. How much lava will be produced