Volcanoes: What They are and What They Teach

Name: Volcanoes: What They are and What They Teach
Author: Judd, John W. (John Wesley)

Judd, John W. (John Wesley) · 1916

Sections of Igneous Rocks, illustrating the passage from the glassy to the crystalline structure. 1. Vitreous Rock. 2. Semi-Vitreous Rock. 3. Vitreous Rock with Sphærulites. 4. Rock with Crypto-crystalline Base. 5. Rock with Micro-crystalline Base. 6. Rock of Granite Structure built up entirely of Crystals.…

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