The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere is:
a. water vapor.
b. nitrous oxide.
c. carbon dioxide.
d. ozone.
e. chlorofluorocarbons
d
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Organic evolution is predictive, supported by a multitude of evidence, and offers a good explanation of observed
phenomena. Organic evolution, therefore, is considered a ____. a. hypothesis b. law c. theory d. unifying concept e. working model
The volcanically active Mid-Atlantic Ridge is marked in Figure 2 with red arrows denoting motion that identifies it as a plate boundary.
A. divergent B. convergent
Detritus feeders and decomposers are most likely found in the
A) E and B horizon. B) A and O horizon. C) B and C horizon. D) C and E horizon.
What causes downwelling?
a) Cold-core ring rotations downward b) El Niño moving South and mixing surface waters c) Marine life going to the bottom of the ocean to find food d) Convergence of surface currents