Inclined sandstones overlying shales. Quickclays overlying granites. Fractured granites exposed at the ground surface. Limestone layers alternating with fractured basalt layers. Steep hillsides with thick soil horizons.
Hard water is water that contains much dissolved a. Sodium and chloride.
Iodine and fluorine. Silicate and sulfur. When seawater contaminates wells along ocean coastlines, this is often caused by a. Rapid rise of sealevel due to global warming. Subsidence of the ground to baselevel. Too rapid pumping of water from the wells.