Discover the wonders of our earth with the Physical Geography DVD Series. This DVD discusses wells, water flow, hydrology, artesian wells and the water table. Subjects covered include: how ground water is stored and moves through rock below the earth's surface; how water is recovered by wells and how the "cone of depression" occurs in a water table; how aquifers or water-bearing rock layers hold water; how the water table is recharged; how artesian wells work; and why some underground water is "hard" and some is "soft." Grades 9-12. 20 minutes on DVD.