The most easily polluted groundwater reservoirs are
a. salt reservoirs
b. sewage plant reservoirs
c. artesian wells
d. water-table aquifers.

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

South america is located within which hemisphere?

What is an additional type of erosion found at the coast? what does it mean?