The use of plants in the cleansing of water includes all of the following except
A. using gravel-filled basins and wetland plants to treat septic-tank effluent, instead of using a conventional drain field.
B. using plant-laden ponds to treat runoff from roads, parking lots and airport runways.
C. removing oil from ground water.
D. using wetlands to cleanse surface water before it moves into ecologically sensitive estuaries and tidal flats.
Answer: C
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A. on vegetated hillsides B. in valleys C. on bare hillsides D. on hilltops
What data were used to develop the first geologic time scales?
A. the fossil record B. analyses of radioactive elements C. uniformitarianism
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