________ are low-pressure air zones enclosed by somewhat circular isobars.
A. Fronts
B. Ferrel cells
C. Cyclones
D. Jets
Answer: C
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The primary factor in the low temperatures of ice-sheet climates is:
a. a generally low absolute humidity of the air b. the minimal insolation received c. the prevailing wind direction d. the number of snow storms
This map shows contours of the water table and the location of a factory that contaminated groundwater. Where would you drill wells to intercept the contamination?
A. southeast of the factory B. southwest of the factory C. right next to the factory D. north of the factory
What is one of the best indicators of the momentum for continued population growth?
A) the death rate and the average life expectancy B) the youthfulness of a population C) the death rate of a population D) the average life expectancy of a population
The process of degrading or depleting resources that are publicly held or available to everyone (like air) is called the _______ of the commons.
Fill in the blank(s) with the appropriate word(s).