Large crystals present in otherwise fine-grained volcanic rock are called:
a) Matrix
b) Megacrysts
c) Porphyroblasts
d) Macrolithons
e) Phenocrysts
Ans: e) Phenocrysts
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Which of the following is true about tsunamis?
A. They form a high wall of water when still in deep water. B. In deep water they are slow enough that a boat can outrun them. C. A tsunami can flood areas that are several kilometers inland. D. All of these choices are correct. E. None of these choices are correct.
The world system's autarkic countries include
A) Bolivia, Burkina Faso, Ghana, Malawi, Samoa and Tanzania. B) Slovakia, Romania, Bulgaria, Latvia, Slovenia and Yugoslavia. C) Canada, Finland, Russia, South Africa, Australia and New Zealand. D) China, Brazil, South Korea, Mexico, Taiwan, India and Argentina. E) Amsterdam, New York, Tokyo, London, Moscow and Beijing.
How does gasoline behave when it leaks into the water table?
A) It floats on top of the water table. B) It sinks to the bottom of the aquifer. C) It dissolves in the water. D) It precipitates.
More and more wind deflection occurs with height because
A) friction increases with height and deflection by the Coriolis Effect decreases with wind speed. B) friction decreases with height and deflection by the Coriolis Effect decreases with wind speed. C) friction increases with height and deflection by the Coriolis Effect increases with wind speed. D) friction decreases with height and deflection by the Coriolis Effect increases with wind speed.