Primary productivity of the open oceans is very limited because of
A) the shortage of water.
B) the shortage of light.
C) the shortage of nutrients.
D) low temperature.
C
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Where has the deadliest political and ethnic conflict, with an estimated war-related 5 million deaths, in the region been?
A) Kenya B) Ivory Coast C) South Africa D) Democratic Republic of the Congo E) Uganda
Radioactive decay in the Earth, especially in the Earth's crust, creates a tremendous amount of
A. pressure. B. heat.
Which of the following is not a possible cause of coral bleaching?
A) ocean acidification B) disease C) pollution D) parasitic relationship between the coral polyp and algae E) sedimentation
Even as early as 1910 in the U.S., services exceeded manufacturing employment
Indicate whether the statement is true or false