Approximately percentage of insolation arriving at the top of the atmosphere is eventually absorbed by the ground?
A. 50%
B. 70%
C. 20%
D. 40%
Answer: A
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The pH of seawater is regulated by its ________.
A. temperature B. carbon dioxide concentration C. pressure D. oxygen
Why do ecosystems and related plant communities in the Rocky Mountains show evidence of altitudinal zonation while the Appalachian Mountains in eastern North America do not?
What will be an ideal response?
What is the basic problem or issue with respect to expanding the world's oil supply in the future?
A. all of the answers listed here B. numerous smaller fields must be found to offset production declines in older fields C. discoveries of new fields peaked in the 1970s D. fewer giant fields are being found today E. remaining deposits are more expensive and difficult to extract
Disposal of radioactive wastes in clay-rich sediments of the deep sea floor
A. would provide some containment of radioisotopes even in the event of leakage of wastes from canisters. B. would be impractical because of the instability of the sea floor. C. is not seriously under consideration because of the danger of water pollution. D. is presently banned by international treaty.