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__ GEOLOGY __
wikipedia __ Scoria
wikipedia __ Pumice
wikipedia __ Ryhyolite
wikipedia __ Andesite
wikipedia __ Basalt
wikipedia __ Granite
wikipedia __ Diorite
wikipedia __ Gabbro
wikipedia __ Peridotite
wikipedia __ Slate
wikipedia __ Phyllite
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wikipedia __ Sandstone
wikipedia __ Slate
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wikipedia __ Chert
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