Which country of Sub-Saharan Africa is the region's unchallenged economic powerhouse, yet also has one of the worst distributions of income in the world?
A) Nigeria
B) Gabon
C) Botswana
D) Sudan
E) South Africa
E) South Africa
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When wolves in the Yellowstone area in Wyoming were eliminated, the population of elk exploded and the coyote willow shrubs were overgrazed. Which type of species did the wolf represent in this ecosystem?
A. keystone B. indicator C. invasive D. nonnative
A projectile shot with an initial velocity of 141 m/s at an angle of 45° follows a parabolic path and hits a stationary balloon at the top if its trajectory. The speed it hits the balloon is
A) 0 m/s. B) 50 m/s. C) 100 m/s. D) 141 m/s.
Drowned glacial valleys along coastlines of submergence are called _______________
Fill in the blank(s) with correct word
Pyroclastic eruptions on a snow-capped volcano
A. can create dangerous lahars. B. cause the volcanic ash to solidify. C. stop when the melting snow cools the eruption. D. are physically impossible.