Tefra: Perbedaan antara revisi
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== Pranala luar ==
* [http://www.geology.sdsu.edu/how_volcanoes_work/Tephra.html How Volcanoes Work]
* [http://facweb.bhc.edu/academics/science/harwoodr/GEOL101/Labs/VolcanicMaterials/ Volcanic Materials Identification]
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