Arsenic-74 is a positron emitter. What isotope is formed when 74As emits a positron?

A) 75Br
B) 70Ga
C) 74Ge
D) 74Se


C

Environmental & Atmospheric Sciences

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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.

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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.

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Severe thunderstorms often occur where the dryline intersects a front or an outflow boundary

a. true b. false

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The deepest thermoclines can be found ____

A) in temperate zones B) in Antarctica C) in the tropics D) anywhere, depending on water salinity

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