Why are plutonic rocks often called massive?
A) They often accumulate as successive layers, appearing banded.
B) They are covered by the ocean.
C) They are very large.
D) They rarely accumulate as successive layers and as result look very different from sedimentary rocks.
Answer: D
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Which option correctly describes an effect of human activity on a river channel?
A) If logging and clearing have increased the sediment load, the channel may fill and the banks may become higher. B) If logging and clearing have increased the amount of runoff, the channel may fill and the banks may become higher. C) If agriculture and building have decreased the amount of runoff, the channel may erode further and the banks will become lower. D) If agriculture and building have increased the sediment load, the channel may erode further and the banks will become lower.
By the end of the twentieth century changes in urban structure in the United States meant that most of the largest cities in the United States were located in ________
A) The Northeast B) The Sunbelt C) The Northwest D) The Great Plains
Thunder is caused by ________.
A. the compression of free photons in the lightning bolt B. high temperatures of lightning that flash heat the surrounding air, causing it to expand explosively C. the compression of free electrons in the lightning bolt D. the combustion of flammable atmospheric gases by the lightning bolt E. the compression of free neutrons in the lightning bolt
The rock debris which accumulates at the base of steep slopes by gravitational action is called ________
A) exfoliation B) talus C) slump D) creep E) vesicles