A force that is important in driving plate tectonics is
A. slab pull.
B. upwelling mantle, such as in hot spots.
C. ridge push.
D. All of these.
Answer: D
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Which of the following is true regarding fuel cell technology?
A. They are only about 40-45% efficient. B. They must receive a constant supply of water and oxygen. C. They must be recharged with an electrical current. D. They were first designed by NASA. E. A fuel cell stack providing all of the electricity for a typical home is not feasible because it would be too large.
Sources of the oceans' salts are believed to include: a. the early atmosphere of the earth
b. all of these choices c. the earth's crust. d. volcanic eruptions.
The Zambia–Zimbabwe river boundary, the Zambezi, plunges over the spectacular Victoria Falls into a series of gorges in ________ Africa
A) north B) southern C) east D) west
Which type of NEO explodes in the atmosphere before reaching the Earth's surface?
A. meteorite B. asteroid C. bolide