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Atmospheric ozone shields the earth from the harmful effects of ultraviolet light radiation.
Uncompacted Clay
Clay that has not been compressed, retaining a high water content and low strength.
Unsaturated Zone
The layer of ground above the water table where soil and rock particles are not fully saturated with water.
Saturated Zone
The layer of an aquifer in which all the pores and rock fractures are filled with water.
Water Table
The level below which the ground is saturated with water.
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