Which activity is least likely to be involved with the sustainable management of freshwater fisheries?
A. supporting populations of commercial and sport fish species
B. facilitating the introduction of commercially important nonnative species
C. preventing overfishing
D. building and stocking reservoirs and farm ponds
E. controlling predators and parasites
Answer: B
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Which of the following statements gives the main reason that night-time radio broadcasts can be sent over long distances?
A. Radio waves propagate more efficiently through cooler, high-density air. B. Radio stations put out more power at night. C. The low D-level region of the ionosphere is weaker at night. D. There is less interference because many radio stations do not broadcast at night.
Dolostone (dolomite) often forms from limestone.
Answer the following statement true (T) or false (F)
Currents that form from the collective movement of wave water refracted off a shoreline are:a
rip currents. b. nearshore currents. c. longshore currents. d. upwelling currents. e. refraction currents.
The ________ is Earth's outermost rocky layer that is broken into plates
A) core B) mantle C) asthenosphere D) lithosphere