The average polarity interval between magnetic reversals over the last 15 million years has been
A) 20,000 years.
B) 200,000 years.
C) 2,000,000 years.
D) 2,000 years.
Answer: B
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Which of the following options gives the proper order for the types of radiation, from shortest to longest wavelength?
A. infrared, visible, ultraviolet B. visible, infrared, ultraviolet C. visible, ultraviolet, infrared D. ultraviolet, visible, infrared
According to the demographic transition model, what trend is true of countries in stage 2 (transitional) of demographic transition?
A. death rates drop, followed by a decrease in birth rates B. birth rates drop, followed by a decrease in death rates C. birth and death rates rise at the same time D. birth and death rates fall at the same time E. total population begins to fall
The management of a wild area by a group of indigenous people, such as the management of wild rice beds, is an example of
A. Privatization B. A communal open access system C. The "free-rider" system D. A communal resource management system E. Tragedy of the commons
Civil war in Liberia broke out between
A. local people and descendants of slaves from the United States B. Hutu and Tutsi C. Christian and Muslim D. citizens and immigrants