Which of the following elements is an alkali metal?

A. cerium (Cr)
B. argon (Ar)
C. lead (Pb)
D. lithium (Li)
E. indium (In)


Answer: D

Environmental & Atmospheric Sciences

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Upper-level winds in the middle latitudes of both hemispheres generally blow from ____

a. the north b. the east c. the south d. the west e. changing directions

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Both channelization and levees can

A. increase flood problems upstream. B. decrease flood problems downstream. C. effectively eliminate floods in the valley. D. increase flood problems downstream.

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Which ocean has the greatest average depth?

A) Indian B) Pacific C) Arctic D) Atlantic

Environmental & Atmospheric Sciences

A likely scenario for causing the population trend shown in the diagram below is



A) the carrying capacity changed.
B) favorable environmental conditions caused a temporary population explosion above the carrying capacity.
C) a keystone predator was removed from the ecosystem at the point that the population began to decline.
D) primary succession began at the time when the population reached its peak.

Environmental & Atmospheric Sciences