Tropical rain forests are estimated to contain up to ____ of the earth's land plants and animal species and ____ percent of the world's land surface.
A. one-half;two
B. one-fourth; four
C. one-third; six
D. two-thirds; eight
E. three-fourths; ten
Answer: A
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Qualitatively, what happens to the hydronium ion concentration if you increase the hydroxide ion concentration?
A) The concentration of H3O+ stays the same but the ratio changes. B) The concentration of H3O+ increases but the ratio stays the same. C) The concentration of H3O+ increases to neutralize the excess hydroxide. D) none of the above
The most abundant rock type deposited during the Kaskaskia sequence was ____
a. the Oriskany Sandstone b. carbonates c. coal d. igneous e. arkose
Externalities, or the costs associated with the harmful side effects of producing goods and services, are reflected in the
cost of those goods and services. a. True b. False
What part of North America contains the oldest exposed rocks?
A. the Appalachian Mountains B. western North America C. the east coast of Canada and nearby parts of the U.S. D. Alaska and western Canada E. the Canadian Shield