Percolation - water that soaks in and moves through soil and rocks below
​                       Earth's surface.

Porosity (pores) - Groundwater moves through spaces between soil particles.
                       These spaces or holes are called pores.  The pores are connected, this
​                        allows water to pass through.

Permeable - A material that allow water to pass through easily.  Allows water to
                       pass through easily. How quickly and easily water flows through soil.
Pollution - Contamination, such as chemical, trash that are released into the
​                       environment.

Impermeable - A material that does NOT allow water to pass through it.