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Hard water (view source)

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Water that has certain dissolved ions in it, predominately calcium ions.<ref>Wile, Dr. Jay L. ''Exploring Creation With ~~Biology~~''. Apologia Educational Ministries, Inc. ~~1998~~</ref>

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Water that has certain dissolved ions in it, predominately calcium ions.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>

==References==

DeborahB.

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