What is population density?
A) the birth rate minus the death rate
B) the birth rate minus the death rate with immigration and emigration also taken into account
C) the average number of people per unit area
D) the amount of farmland per person
E) the total number of people in urban areas, minus the number of people in rural areas
C
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Which of these irrigation methods is most effective at reducing soil salinization?
A. drip B. gravity-flow C. center pivot, low pressure D. high pressure spraying
Small-scale maps cover ________ areas than large -scale maps.
A) the same B) smaller C) larger and smaller D) larger E) it cannot be determined
Which of the following instruments are used routinely to measure wind and temperature throughout the troposphere and stratosphere?
A. mercury barometer B. stethoscope C. radiosonde D. ceilometer
Drainage basins with channel systems that convey water to the ocean ____
a. flow to a temporary base level b. have exterior drainage c. flow to a regional base level d. have interior drainage