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

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