Which of the following materials has moderate to high porosity but low permeability?

A) fractured sandstone
B) uncompacted clays
C) well-sorted gravel
D) well-sorted sand

Permeability

A measure of how easily fluids can flow through a porous rock or material.

Uncompacted Clays

Clay material that has not been subjected to pressure, typically soft and easily deformed, often leading to stability issues in construction.

Porosity

The measure of empty spaces within rocks or soil, determining their ability to absorb and hold water or other fluids.