At today's rate of consumption, the world's known reserves of tantalum will last about ________ more years at today's rate of consumption, but if everyone in the world began consuming tantalum at the rate of U.S
citizens, then it would last for only ________ years.
A) 15; 5 B) 50; 15 C) 200; 50 D) 50; 5 E) 200; 15
E
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The principle of original horizontality states that ____________________ rocks were deposited in
horizontal layers. Thus, if rock layers are now ____________________, they must have been disturbed after lithification. Fill in the blank(s) with the appropriate word(s).
Upper-level pressure height charts are produced how many times a day by the National Weather Service?
A) one B) two C) three D) four
Captive breeding programs in zoos ____.
A. eliminate the need to preserve critical habitats B. can be used for most species except mammals C. require the captive population to number between 100 and 500 D. increase the genetic variability of species E. are unsuccessful
Color depends on what characteristic of light?
A) its frequency B) its wavelength C) both A and B D) neither A nor B