GEOLOGY

Detailed explanation-1: -Permeability is a measure of the interconnectedness of pores. The connection between pore spaces allows groundwater to flow through the sediment or rock. The combination of water storage (porosity) and flow (permeability) makes a good aquifer-a rock unit or sediment that contains usable groundwater.

Detailed explanation-2: -Answer and Explanation: b) Sandstone would be the best aquifer. Sandstone is a sedimentary rock, comprised of sand-size grains of minerals and rocks, that can hold water.

Detailed explanation-3: -Porosity is the amount of empty space in sediments or rocks. In a soil or rock the porosity (empty space) exists between the grains of particles or minerals. In a material like gravel the grains are large and there is lots of empty space between them since they have angularity or spherical shape.

Detailed explanation-4: -Aquifers must be both permeable and porous and include such rock types as sandstone, conglomerate, fractured limestone and unconsolidated sand and gravel. Fractured volcanic rocks such as columnar basalts also make good aquifers.