The crown-of-thorns sea star destroys coral reefs by ________
A) covering the coral with sediment
B) depleting dissolved oxygen
C) eating the coral polyps
D) excreting waste on the coral
E) releasing toxins that kill zooxanthellae
C
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There is a great deal of cropland but very little pasture and rangeland in ________
A) North America B) Europe C) Africa D) Australia
What is not considered to be a hidden cost of a gallon of gasoline?
A. government subsidies for oil companies B. tax breaks for car manufacturers and road builders C. research and development for hybrid cars D. cost of pollution control and cleanup E. costs of military protection of oil supplies in the Middle East
If a well has a cone of depression associated with it because of overpumping of the groundwater, what is a possible consequence?
A. Groundwater, which may contain pollutants, will flow away from the cone of depression and the well will be safe from pollution. B. Any pollutants in the flowing groundwater will be filtered out before reaching the cone of depression. C. Groundwater, which may contain pollutants, will flow toward the cone of depression and cause a polluted well.
A longshore current
A. forms where waves approach the beach at an angle. B. carries sand down a deep sea canyon and away from shore. C. flows out to sea from the mouth of a river. D. All of the choices are correct.