GEOLOGY

Detailed explanation-1: -Answer and Explanation: Answer: Aquifer. An aquifer is a permeable underground layer of rock, sand, and gravel saturated with groundwater.

Detailed explanation-2: -Gravel is highly porous and permeable because each space between a piece of gravel is a pore that water can get into. Because the pores are large and close together, water can travel through it easily. By contrast, clay has smaller pores.

Detailed explanation-3: -An underground layer of permeable rock or sediment that holds water and allows it to flow is called an aquifer. Aquifers do not have unlimited sources of water. The rate that water moves in an aquifer depends on the slope of the water table and the permeability of the rocks.

Detailed explanation-4: -Gravel and sand are both porous and permeable, making them good aquifer materials. Gravel has the highest permeability.

Detailed explanation-5: -Because they have large and connected spaces, materials such as sand and gravel allow water to pass through, or permeate. They are thus known as permeable materials.