The EPA is charged with cleaning up brownfields, which are ________
A) urban areas contaminated by acid drainage from mining
B) agricultural lands polluted by acid and heavy metals
C) lands whose reuse or development is complicated by the presence of hazardous materials
D) desert regions used for unsafe nuclear waste disposal
E) coastal seagrass beds damaged by industrial dumping
C
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Water's temperature at the bottom of Lake Tahoe, high in the Sierra Mountains in California, at this moment is
A. 4°C. B. below 4°C. C. above 4°C. D. uncertain.
Carbon dioxide is removed from the atmosphere through the process of ____
A) fuel combustion B) respiration C) volcanic activity D) photosynthesis
Despite recent economic growth, almost half of the people in Sub-Saharan Africa subsiston less than $1.25 per day
a. True b. False Indicate whether the statement is true or false
Because prairie dogs have a major effect on the ecological functioning of their habitat and the health of other members of their community, they are considered to be
A. an indicator species. B. a flagship species. C. a keystone species. D. an umbrella species.