Dredging of a lake bottom

A. can cause sediment pollution.
B. may be done to remove toxic pollutants attached to sediment particles.
C. may reduce nutrient recycling from sediments.
D. All of the choices are correct.


Answer: D

Environmental & Atmospheric Sciences

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According to the United Nations, from 30% to 60% of all water supplied in all of the world's major cities in developing countries is

a. used for crop irrigation b. lost through leakage of water mains, pipes, pumps, and valves c. recycled as grey water d. used for watering landscaping e. polluted

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When corn is used to produce ethanol for fuel, the process also generates

A) proteins and cellulose. B) biodiesel and natural gas. C) livestock feed and corn oil. D) methane used to heat thousands of homes.

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The prevailing wind is defined as the instantaneous direction of the wind at the moment of observation

Indicate whether the statement is true or false

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Which of the following is an example of a detrital food chain?

A. sewage treatment plant B. salt marsh C. a coniferous forest D. open lake

Environmental & Atmospheric Sciences