In the regions of the dead zone in the Gulf of Mexico just west of the Mississippi River delta, oxygen levels are
A) highest at the bottom of the ocean, where the algae do not get enough sunlight to survive.
B) highest at middle ocean depths, where plants produce the most oxygen.
C) highest at the ocean surface, away from oxygen depleting bacteria.
D) lowest at the ocean surface, where fertilizers bind to and remove the oxygen.
C
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All physical forms of water (solid, liquid, and gas) make up the
a. Atmosphere b. Geosphere c. Biosphere d. Troposphere e. Hydrosphere
A soft energy path is one that
a. relies on improving energy efficiency and increasing the use of a variety of renewable energy resources b. relies completely on the use of biofuels c. relies on the use of liquid fossil fuels d. relies on the use of soft money for research and development e. relies on soft coal
The principle of ____________ ____________ is based on the observations of Forchhammer that conclude although
the total amount of dissolved solids in seawater might vary among samples, the ratio of major salts is constant. Fill in the blank(s) with the appropriate word(s).
________ have resulted in mass coral bleaching and ocean acidification (due to absorption of excess CO2), which destroy the coral in the Great Barrier Reef
A) Too many divers and tourists B) Rising sea temperatures C) Bleach spilled from tankers off Australia's coast D) Oil spilled from tankers in the Coral Sea