Earthquakes may occur along
A) transform boundaries.
B) convergent boundaries.
C) divergent boundaries.
D) plate boundaries.
Answer: D
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A ceilometer, an instrument included in the Automated Surface Observing System (ASOS) instrument array, is used to measure
A) wind speed and direction. B) visibility. C) cloud height. D) amount of precipitation. E) relative humidity.
Which of the following is NOT a good source region for air masses?
A) central Canada B) the Gulf of Mexico C) the central United States D) the North Pacific
In developed countries, the most recent increases in agricultural productivity have come from ________
A) irrigation in arid areas B) clearing rainforests C) extensive drip irrigation use in farming D) clearing grasslands and savannas E) new crop varieties and polyculture techniques
Primary air pollutants ____, whereas secondary pollutants _____
A) enter the atmosphere directly; form by chemical actions involving other pollutants B) form through a series of chemical reactions; occur naturally C) occur naturally; are synthetic D) enter the atmosphere directly; enter the atmosphere through human intervention