If a star collapses to a tenth its size, gravitation at its surface increases by
A. one hundred.
B. one thousand.
C. twenty.
D. ten.
E. more than one thousand.
Answer: A
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A student was asked the following question: What are the environmental factors that determine the
development of soils, and which are the most important regarding the rate of development? As an answer, the student wrote the following, "The environmental factors that determine the development of soils are climate, parent material, relief of the land, and time. Climate and parent material are the most important factors for the rate of soil development." How would you judge this student's answer? a. EXCELLENT (The response answers both parts of the question, and all statements are complete and correct.) b. VERY GOOD (The response answers both parts of the question, all statements are correct, but one part is not answered completely.) c. GOOD (The response only answers one part of the question, all statements are correct, but the other part of the question is not answered.) d. MEDIOCRE (One part of the question is answered completely and correctly, but the other part is answered incorrectly.) e. UNACCEPTABLE (The response does not correctly answer either part of the question.)
Ecotourism _____.
A. is a reasonable option only in impoverished countries B. decreases biodiversity by causing increased speciation in environmentally sensitive areas C. increases biodiversity by providing income to areas that might otherwise be destroyed D. decreases biodiversity by selling souvenir organisms
One of the most important and effective ways to reduce flooding is to ____.
A. preserve and restore wetlands B. drain wetlands C. increase groundwater withdrawals D. encourage people to build on floodplains E. clear vegetation
In a ____ climate type, precipitation is less than half the potential evapotranspiration
a. desert b. steppe c. tropical savanna d. tropical monsoon e. temperate forest