Hurricanes are powered by
A. The hydrologic cycle
B. Sinking air masses
C. Rising air masses
D. Subtropical jet streams coupled with convection currents
E. The heat released from condensing water vapor
Answer: E
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The thickness of Earth's crust
A. on average is about 10 km. B. varies from about 5 km under the oceans to about 70 km under the continents. C. varies from about 10 km under the continents to about 60 km under the oceans. D. on average is about 60 km.
What resource base of Mongolia has been recently exploited?
A) minerals B) labor C) timber D) horses E) hydropower
As a wave approaches the shoreline and enters shallower water, energy and water move forward causing the water to rise and cascade down from the wave crest as a breaker. These waves are called
A) waves of translation. B) swells. C) waves of transition. D) tidal waves.
The separation of South America from Africa occurred during the
a. Triassic. d. Permian. b. Jurassic. e. Tertiary. c. Cretaceous.