GEOLOGY

Detailed explanation-1: -Aquifers must not only be permeable but must also be porous and are found to include rock types such as sandstones, conglomerates, fractured limestone and unconsolidated sand, gravels and fractured volcanic rocks (columnar basalts).

Detailed explanation-2: -An aquifer is a body of saturated rock through which water can easily move. Aquifers must be both permeable and porous and include such rock types as sandstone, conglomerate, fractured limestone and unconsolidated sand and gravel.

Detailed explanation-3: -For a geologic material to be considered an aquifer, it must be saturated, where its pore spaces are filled with water, and it must be permeable.

Detailed explanation-4: -The best sources of ground water, called aquifers, have high porosity and also high permeability. Sand, gravel, and fractured rock make the best aquifers.

Detailed explanation-5: -For groundwater to be able to get into a rock with good porosity it must also have good permeability. For a rock to be permeable and for water to move through it, the pore spaces between the grains in the rock must be connected. Permeability is therefore a measure of the ability of water to move through a rock.