What is the most efficient means of water delivery to crops?

A. center-pivot sprinkler systems
B. flood irrigation
C. trickle or drip irrigation
D. gravity-flow canal systems
E. diagonal-pivot systems


Answer: C

Environmental & Atmospheric Sciences

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The world is divided into ________ standard time zones

A) 11 B) 15 C) 24 D) 180 E) 360

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Lake-effect snow occurs only during the early spring

Indicate whether the statement is true or false

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The ecology of San Francisco Bay is being disrupted by ________.

A. Asian clams and European green crabs B. Asian clams C. comb jellies D. Asian clams, comb jellies, and European green crabs E. European green crabs

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Surface waters are pushed away from land and replaced by nutrient-rich deep water through ________

A) convergence B) downwelling C) land breezes D) sea breezes E) upwelling

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