Blue whales time their migration through middle latitude and polar oceans to coincide with maximum ________ productivity
A) dinoflagellate
B) photosynthetic bacteria
C) phytoplankton
D) primary
E) zooplankton
E
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Which of the following is geologically related to the shrinking of the Mediterranean Sea?
A. the uplifting of the Zagros Mountains in western Iran B. the fjords of the Scandinavian coastlines C. the zone of crustal divergence along the floor of the Mediterranean Sea D. the mountain chains of Southern Europe
The west coast of the United States receives two high tides and two low tides of varying heights per
day. What kind of tidal pattern is this? a. Diurnal tides b. Semidiurnal tides c. Semidiurnal mixed tides d. Spring tides
A boiling-water nuclear reactor differs from a pressurized-water reactor in that
A. a boiling-water reactor produces steam in the reactor. B. boiling-water reactors are more common than pressurized-water reactors. C. a pressurize-water reactor is more likely to release small amount of radioactive materials in the steam. D. a boiling-water reactor produces steam in a separate steam generator.
China has considerable rare-earth metal reserves. Which situation is a problem for the U.S.?
A. They are stockpiling these reserves and reducing exports to meet their own needs. B. Since they are a critical component in a nuclear warhead, this situation could tip the nuclear balance in their favor. C. The mining and processing is causing pollution on a worldwide scale. D. China artificially depressed the price of these metals causing other producers to stop mining.