Which of the following statements about cratons is not true?
A) They have been tectonically stable for more than 500 million years.
B) They are usually less than a half of a kilometer above sea level.
C) They are exterior regions of continents.
D) They may be broken by faults.
Answer: C
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A) radiation B) high C) advection D) evaporation
________ is primarily responsible for spreading thousands of invasive alien species around the world.
Fill in the blank(s) with the appropriate word(s).
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