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Hard water (view source)

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

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'''Hard water''' is [[water]] which has certain dissolved [[ion|ions]] in it, predominately [[calcium]] ions.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>

==References==

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