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  2. 2Tqq What Is The Activity Of Crushing Rocks Known As

2Tqq What Is The Activity Of Crushing Rocks Known As

Volcanic Geodes. The most widely known and sought-after geodes are those that formed in areas of volcanic activity. Voids in basaltic lava flows often are infilled with agate, quartz, opal and other material delivered by hydrothermal water or groundwater. Some voids are spaces occupied by gases that failed to escape the lava flow before its surface crusted over.

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