Tephra

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Tephra
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aa
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Pahoehoe
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Ash
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Pillow Lava
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Cinder Cone
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Shield Volcano
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Stratovolcano
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Batholith
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Laccolith
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Volcanic Neck
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Lahar
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Skylight
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Caldera
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Dike
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Sill
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Lava Delta
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Lava Tube
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Flood Basalts
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Hot
Yellowstone
Spot
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Tuff
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Pyroclastic Flow