In the mining districts of the Bolivian and Peruvian Andes, what was the most important mineral excavated during the colonial period?

A) gold
B) silver
C) copper
D) iron
E) none of the above


Answer: B

Environmental & Atmospheric Sciences

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The type of basin shown in this figure is a



A) passive margin.
B) normal-fault basin.
C) foreland basin.
D) basin along a strike-slip fault.

Environmental & Atmospheric Sciences

The outer bank of a meander in a meandering stream is called the ____________________, where

(erosion/deposition) ____________________ takes place. The deposit on the opposite side of the channel is called the ____________________, which is where (erosion/deposition) ____________________ occurs. Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

Ozone thinning is

A. greatest in the Northern Hemisphere in October. B. evenly distributed for most of the year. C. greatest in the Southern Hemisphere in April. D. more pronounced in Antarctica than the Arctic.

Environmental & Atmospheric Sciences

Mollusks and crustaceans are most likely to live in the ________ zone of a lake

A) littoral B) limnetic C) profundal D) neritic

Environmental & Atmospheric Sciences