Groundwater as a water source may be better than surface water because
A) groundwater may be naturally purified by percolation through soil.
B) groundwater is a self-replenishing resource that cannot be exhausted.
C) surface water is not naturally self-replenishing.
D) groundwater is more easily located than surface water.
Question 2
Some of the most toxic organic compounds, widely used in plastics, pesticides, and solvents, are the
A) heavy metals.
B) chlorinated hydrocarbons.
C) sulfated hydrocarbons.
D) radioactive hydrocarbons.
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