Industrial agriculture ________
A) permanently improved soils, providing more food from less space
B) rapidly deteriorated soils, requiring continuous movement to new croplands
C) is necessary today for all cultures
D) had no impact on agriculture
E) increased our ability to obtain more food from the same area
E
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Which viewpoint is shared by biologists about acceleration of the extinction rate caused by human activities?
A. It is probably the most serious environmental problem we face. B. It is not a concern because other species will quickly take their place. C. It is regretful, but the earth was made for humans, not other species. D. It is not a problem because we can just bio-engineer new species.
The electric field that travels in the wires of an AC circuit
A. changes direction with time. B. is nonexistent. C. changes via the inverse square law. D. remains relatively constant.
Polymorphs are minerals that will have two identical mineral structures, but different chemical compositions
Indicate whether this statement is true or false.
Seismic gaps represent
A. areas along an active fault where surface indications of the fault are absent. B. "locked" sections along otherwise active faults. C. periods of reduced or no seismic activity in the geologic record. D. areas where there is little or no risk of earthquake activity.