The only herbivorous marine mammal is a ________.
A. sea lion
B. seal
C. grey whale
D. manatee
E. sea otter
Answer: D
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A country that pursues a policy of import substitution
A. buys manufactured goods from several suppliers, increasing competition. B. replaces some imported goods with others of higher quality. C. attempts to develop domestic industries instead of importing goods. D. abandons investment in industry in favor of the service sector.
Rainwater causes chemical weathering by
A) adding water molecules to rock. B) applying a force to rock. C) taking minerals out of rock and putting them in solution. D) removing rock's surface layer.
Ancient current directions can be determined by:
a. wave-formed ripple marks. b. cross-bedding. c. graded bedding. d. mud cracks. e. all of the above
In developing countries, most sewage is
A. handled via communal septic tanks. B. discharged, untreated, into surface waters. C. subjected to both primary and secondary sewage treatment. D. subjected to primary (physical) but not chemical treatment.