The best aquifers are comprised of these rocks:

Question

Quizplus · Accepted Answer

The best aquifers are typically made up of permeable materials such as sand and gravel that allow water to flow through easily. This allows for greater storage and ease of extraction of groundwater. Quartz and silica (A) are relatively impermeable and therefore not typically good aquifer materials. Basalt and granite (B) are relatively dense and compact, making them not ideal for water storage. Schist and gneiss (C) can be highly variable in their permeability, but generally are not as porous as sand and gravel. Ash and dust (E) are also generally not ideal aquifer materials as they tend to be fine-grained and not highly porous.

The Best Aquifers Are Comprised of These Rocks