( ) aquifers are harder to contaminate, but ( ) aquifers are easier to clean up once contaminated.

( ) aquifers are harder to contaminate, but ( ) aquifers are easier to clean up once contaminated.

( ) aquifers are harder to contaminate, but ( ) aquifers are easier to clean up once contaminated.




a. artisian, water table
b. confined, unconfined
c. unconfined, confined
d. water table, artesian
e. watershed, floodplain



Answer: b