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| First Page | Document Content | |
|---|---|---|
 Date: 2013-07-10 11:43:37Plate tectonics Tephra Volcanoes Igneous petrology Volcanic ash Climate change Types of volcanic eruptions Geology Petrology Volcanology |
| First Page | Document Content | |
|---|---|---|
Date: 2013-07-10 11:43:37Plate tectonics Tephra Volcanoes Igneous petrology Volcanic ash Climate change Types of volcanic eruptions Geology Petrology Volcanology |
