Plate tectonic movement results from ________
A) mass wasting
B) high surface winds and erosion
C) molten materials from the core escaping to the surface
D) convective movements of rock in the underlying mantle
E) unstable surface rock formations
D
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It is predicted by demographers that how many people will live in the North American Region by the year 2050?
A) 423 million B) 270 million C) 323.9 million D) 41 million E) 464 million
Meandering streams have semi-circular cross-sections along most of their length. Indicate whether the statement is true or false
Popular music is written
A) mostly for one group in one place. B) only for the younger generation of a population. C) to appeal to a large number of people. D) to endure for a long period of time, forever if possible. E) without purpose and becomes popular by accident.
Physical weathering is greatest under conditions of
A) lower temperatures and higher precipitation. B) higher temperatures and precipitation. C) a lack of moisture at the surface. D) temperatures that reach below freezing.