The pump-and-treat method is
A. ineffective in cleansing contaminated water well enough to be used as a drinking water supply.
B. the surface treatment of polluted groundwater that has been removed from an aquifer.
C. the process by which municipal sewage is treated before discharge into a river.
D. a fast, effective and inexpensive means of treating contaminated groundwater.
Answer: B
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Using duckweed in a lagoon as low-tech sewage treatment plants is an example of
A. Tertiary sewage treatment B. Extraction techniques of remediation C. Bioremediation D. A containment method of remediation E. In vitro extraction techniques
Extensive burrowing by organisms that may destroy structures by thoroughly disrupting
sediments is called _____________. Fill in the blank(s) with the appropriate word(s).
In the classical view of the economic system in this figure, we expect businesses to prosper when
A) labor costs are low and household incomes rise. B) demand for goods and services decline. C) labor is in short supply and consumption is declining. D) the value of land and resources increase.
The Rotterdam subway was built by
A. building the tunnel in segments which were flooded, sunk into position, then joined and pumped dry. B. draining water from below the city to allow excavation of a dry tunnel. C. baking the ground to harden the clays, then blasting the tunnel through. D. raising the tunnel on stilts to keep it above the local water table.