The Ogallala Aquifer supplies water to ________ and once held more water than all of the surface water ________.
A. The Rocky Mountain states; in the United States
B. Arizona and Las Vegas; in the United States
C. The Great Plains states; in the world
D. Most of New England; in the United States
E. California's Central Valley; in the world
Answer: C
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Use the accompanying figure of the Mohs scale of hardness to answer this question. If you have a mineral sample that is capable of scratching a penny but is scratched by a wire nail, its hardness must be ________
A) less than 3.5 B) between 3.5 and 4.5 C) greater than 4.5 D) less than 2.5
Water covers ________ percent of Earth's surface.
A. 17 B. 71 C. 29 D. 78 E. 50
What percentage of Americans over the age of 6 have trace levels of BPA in their bodies?
a. 93% b. 95% c. 90% d. 83% e. This applies to citizens of other developed countries, but not America.
Soil formation is dependant upon
A. climate. B. time. C. nature of the parent material and organic matter. D. topography. E. All the choices are correct.