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![]() Date: 2003-05-13 20:09:48Volcanic rocks Tephra Lake Ilopango Caldera Tephrochronology Pyroclastic rock Ignimbrite Dense-rock equivalent Crater lake Geology Volcanology Igneous petrology | Source URL: www.geo.mtu.eduDownload Document from Source WebsiteFile Size: 253,88 KBShare Document on Facebook |