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Volcanology / Volcanic rocks / Northern Cordilleran Volcanic Province / Igneous rock / Basanite / Phonolite / Pyroclastic rock / The Volcano / Petrology / Geology / Igneous petrology


that of the interior, the absolute hardness of both has decreased with respect to the initial value, to an extreme degree in the tonalite and only moderately in the dolerite. This variety of differential weathering is be
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Document Date: 2011-05-06 04:04:07


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