In which of the following periods did the Viking colony in Greenland perish?
A. climatic optimum
B. Pleistocene epoch
C. Mt. Pinatubo explosion
D. Little Ice Age
Answer: D
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In the reaction below, what does the symbol ? mean? OH- + NH4+ ? H2O + NH3
A. It means that the forward and backward reactions are happening at the same time. B. It means that the forward reaction does not progress. C. It means that the backward reaction happens as fast as the forward reaction and so the proton is not transferred at all. D. It means that the reaction cannot decide which way to go. E. none of the above
Which of the following would decrease the severity of air pollution in Los Angeles?
A) Offshore breezes B) Valley surrounded by mountains C) Onshore breezes D) Inversion conditions
The centers of gyres tend to be ____
a. high energy with high productivity b. high energy with high salinity and little productivity c. calm and support high productivity d. calm and support relatively little life e. high energy with strong winds and storms
On the average, how much of the Sun's energy that is intercepted by Earth is reflected back to space?
A) 40% B) 10% C) 20% D) 30%