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Intrusive and Extrusive Igneous Rock Bodies Adapted from Edgar Spenser's The Dynamics of the Earth, 1972 
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| Ig. Home | Simp.Class. | Advanc.Class. | Alpha.List | Bowen's Reac.Srs. | ID Keys | Extrus/Intrus | Tect. | Self Tests |
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Intrusive and Extrusive Igneous Rock Bodies Adapted from Edgar Spenser's The Dynamics of the Earth, 1972
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| Last Update: 9/29/00 | e-mail: (Fichtels@jmu.edu) |