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Natural SciencesEarth SciencesGeologyGeochemistryMineralogyVolcanologyGeologic HazardsVolcanic DepositsVolcanic GeochemistryVolcanic HazardsVolcanic PetrologyVolcanic RocksChlorine ChemistryChlorine Isotope GeochemistryMagma Halogen GeochemistryRift Valley TopographyVolcanic Gas GeochemistryVolcanic Hazard Assessment