In order to protect aquifers from pollution, the bottoms of waste dumps should be lined with
A) gravel.
B) sand.
C) clay.
D) soil.

Question

Quizplus · Accepted Answer

Clay is the best choice for lining the bottoms of waste dumps to protect aquifers from pollution. Clay has very low permeability, meaning that it does not easily allow substances to pass through it. Therefore, it can effectively block pollutants from reaching the aquifers. Gravel and sand are too porous and allow water to pass through them easily, while soil may contain organic matter that can break down and release contaminants.

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