GEOLOGY

Detailed explanation-1: -Thus, the correct answer is ‘Clay soil.

Detailed explanation-2: -Clay is the most porous sediment but is the least permeable. Clay usually acts as an aquitard, impeding the flow of water. Gravel and sand are both porous and permeable, making them good aquifer materials.

Detailed explanation-3: -Clay, the smallest particle, has the least amount of pore space.

Detailed explanation-4: -Porosity depends on the size, shape, and mixture of grains and particles that compose soil and rock. For instance, small particles such as clays are able to compact more closely together, reducing the amount of porosity.