Arsenic-74 is a positron emitter. What isotope is formed when 74As emits a positron?
A) 75Br
B) 70Ga
C) 74Ge
D) 74Se
C
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The leading nonpoint source of water pollution is
A. municipal landfills. B. runoff from city streets and storm sewers. C. agriculture. D. industrial wastes. E. leaks from offshore oil wells.
Severe thunderstorms often occur where the dryline intersects a front or an outflow boundary
a. true b. false
The deepest thermoclines can be found ____
A) in temperate zones B) in Antarctica C) in the tropics D) anywhere, depending on water salinity
Attracting a new basic industry is important to a community, primarily because it
A) changes the community's functional classification. B) stimulates new nonbasic industries. C) disrupts the central place hierarchy. D) changes the nation's rank-size distribution of settlements. E) replaces obsolete industry.