Which of the following materials probably has the lowest permeability?

A) highly fractured granite
B) compacted clay with abundant tiny pore spaces
C) loosely cemented, well-sorted sediment
D) loosely cemented, well-rounded sand grains

Permeability

Permeability is a measure of how easily a fluid can move through a porous material, such as soil or rock, indicating the material's ability to transmit water or other fluids.

Compacted Clay

Clay soil that has been compressed, often leading to reduced water infiltration and aeration.

Pore Spaces

Voids or gaps between soil particles or rock, which can hold air or water and are critical for fluid flow and organisms.