On a weather map, a line indicating constant pressure is best termed an
A) isoplot.
B) isotherm.
C) isotach.
D) isoline.
E) isobar.
E
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A sustained flow of electric charge requires
A. a potential difference. B. a resistance. C. electric polarization. D. an electric field.
Subsistence agriculture
A) produces food for the direct consumption of the growers and their families. B) is designed to produce a surplus for sale. C) does not include the raising of livestock. D) has grown in importance over the course of the twentieth century.
The first function of water vapor in the earth's original atmosphere was to:
A) create oxygen. B) increase the amount of carbon dioxide in the atmosphere. C) block the solar wind. D) fall as rain and thus fill the oceans. E) provide needed nourishment for primitive plants.
Which of the following involves energy storage in the water molecule in the form of latent heat?
A. melting, evaporation, sublimation B. freezing, condensation, deposition C. condensation, evaporation, deposition, sublimation D. melting, freezing, condensation, deposition