GEOLOGY

Detailed explanation-1: -Water stops passing through rocks underground when it reaches an impermeable layer. Water stops at the most porous rock layer.

Detailed explanation-2: -Pertaining to a rock that is incapable of transmitting fluids because of low permeability. Shale has a high porosity, but its pores are small and disconnected, so it is relatively impermeable.

Detailed explanation-3: -Some rocks, such as sandstone or chalk, let water soak through them. They are called permeable rocks. Other rocks, such as slate, do not let water soak through them. They are called impermeable rocks.

Detailed explanation-4: -Impermeable rocks include shales and unfractured igneous and metamorphic rocks. The water table is the natural level of liquid ground water in an open fracture or well.