Saltwater intrusion into freshwater (drinking water) supplies can occur when
a. land subsidence occurs
b. snowpack is used as drinking water in areas close to saltwater bodies
c. groundwater is withdrawn near saltwater bodies
d. water is drawn from desert lakes to irrigate crops
e. runoff of agricultural fields drains into wells
C
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What is the speed of sound in seawater of average salinity at the surface?
A) the same as the speed of light in the same conditions B) approximately 1,000 feet per second C) about 1,500 meters per second D) twice the speed of sound in air
Conduction heats: a. the entire atmosphere
b. only the troposphere. c. only the lowest few centimeters of the atmosphere. d. None of these choices.
Which of the preserve shapes shown is the worst shape for a species that requires a core area?
A. A B. B C. C D. D E. All of the shapes have about the same measurements
This is the major river system in West Africa
A) Niger B) Congo C) Zambezi D) Nile E) Okavango