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Line 1: − The point along a [[fault]] where an [[earthquake]] begins.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>+
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A '''focus''' is a point along a [[fault]] where an [[earthquake]] begins.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
==References==
==References==