In the United States, desertification
A. is not a concern because few people live in the areas at risk.
B. can be avoided by more extensive use of ground water.
C. is not a concern, because we have few deserts.
D. may affect broad areas of the Sun Belt and plains states.
Answer: D
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The law of reflection tells us that the incident ray, reflected ray, and normal
A. lie in planes that are perpendicular to one another. B. lie in the same plane. C. are not restricted to any direction. D. may or may not lie in the same plane.
The ____ comprise the highest percent of ocean area, but contain the lowest percent sediment volume
a. continental shelves b. continental slopes c. deep-ocean floor d. continental rises e. submarine canyons
Which location on this figure from the Investigation is located on a divergent plate boundary?
A. 1 B. 2 C. 3 D. 4 E. 5
What is by far the greatest threat to human health on a global basis?
A. AIDS B. poverty C. dengue fever D. malaria E. industrial chemicals