Which of the following is an example of a persistent pollutant?
A. Bacteria in treated sewage sludge that is spread on fields.
B. DDT which is found in soil years after its use but is eventually destroyed by soil bacteria.
C. Organophosphate insecticides that kill insects for several days but do not bioaccumulate in food chains.
D. Carbon monoxide that breaks down after reacting with oxygen.
E. None of these is an example of a persistent pollutant.
Answer: B
You might also like to view...
What was the Meteor expedition's most important innovation?
A) The echo sounder B) The bathyscaphe C) Modern optical equipment D) The steam winch
The city of Greenville has decided to build a new power plant. A government grant will help pay the building costs based upon the amount of CO2 that the new plant produces: the less CO2 emissions, the greater the value of the grant. The rest of the building cost will have to be paid by local taxpayers. Based upon this factor alone, which type of power plant would be the best option for the city?
A. Nuclear power B. Natural gas C. Coal
At the Tropic of Cancer the sun is directly overhead at noon on the
A) vernal equinox. B) summer solstice. C) autumnal equinox. D) winter solstice.
Wave refraction ____
a. is the suspension of sediment by a breaking wave b. occurs because of rip currents c. occurs in the offshore zone d. causes erosion of headlands and deposition in embayments