Solar radiation arriving at Earth's atmosphere and surface is called
A) solar constant.
B) solar wind.
C) auroras.
D) thermosphere.
E) insolation.
E
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Desertification is
A) expansion of the desert due to the seasonal changes in precipitation. B) expansion of the desert due to human degradation of the environment. C) expansion of the desert due to loss of biodiversity. D) desert belts that extend across the north of the continent. E) removal of vegetative cover from tropical environments.
The actions of ____________________ and ____________________ are responsible for most soil
erosion. Fill in the blank(s) with the appropriate word(s).
This stage of a thunderstorm is associated with cool downdrafts.
A. Mature stage B. Dissipating stage C. Cumulus stage
Which of the following is CORRECT regarding soil color?
A) Soil color is a relatively unimportant physical property of soil. B) Dark soils always indicate high organic content. C) Color reflects composition and chemical makeup of a soil. D) Soil color is used solely to determine the moisture content of soil—darker soils have a higher moisture content, whereas lighter soils have less water content.