In Order to Protect Aquifers from Pollution,the Bottoms of Waste

question 27

Multiple Choice

In order to protect aquifers from pollution,the bottoms of waste dumps should be lined with ________ in order to ________.

• A)sand slow down the rate at which wastes decompose
• B)clay reduce the rate at which contaminated water moves out of a dump
• C)clay increase the rate at which wastes decompose
• D)gravel increase the permeability of the floor of the dump so that the rate at which water migrates out is increased,thereby diluting the contaminated discharge
• E)gravel reduce the rate at which wastes flow out of the dump