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Unformatted text preview: of saturation. Draw & label these layers using diagram on p. 241. Soil & rock holds water: A. Porosity – ratio of the volume of air space in the rock to the total volume of the rock. Large grained rocks & soil have greater porosity than small grained rocks or soil. B. Permeability – ability of rock to allow water to pass through. (A porous rock may not be permeable. It depends on the extent to which the pores are connected.) 1. Aquifer – a permeable rock layer that transports water underground. 2. Wells must be drilled into an aquifer. 3. Artesian well – pressure pushes water up out of the ground without a pump. Draw the aquifer pictured on p. 243....
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- Fall '10
- Hydrology, Ground Water, Runoff moves water