Most geologists think that the flat summits of seamounts ________.
A. are remnants of the continental shelf
B. are fault surfaces
C. are uplifted sea floor
D. are remnants of plateau basalts
E. were eroded flat by wave action
Answer: E
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Which one of the following is likely to be associated with a loss of genetic diversity in a local population of a species?
A. The arrival of individuals of the same species from distant populations. B. Genetic mutations. C. A 90% reduction in the size of the population. D. Mating with individuals from other populations.
The U.S. steel industry moved westward in the nineteenth century primarily because of better access to
A) coal. B) iron ore. C) labor. D) transport. E) markets.
Exposure to 1.0 roentgen of which of the following types of radiation causes the formation of the most ions?
A) a B) b C) g D) They all form the same number of ions.
A valley train is ____
a. a string of lakes in a glaciated valley b. a deposit of till where a hanging valley entered the trunk glacier c. a first-order tributary glacier d. stream-deposited sediment just beyond the toe of a valley glacier