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California
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Edinburgh
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Aa
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Aeolian Buttes
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Alpine Texas
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Alteration channels
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Andesite dike
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Andesite dikes
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Augusta
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Auvergne
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Axum
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B. G. J
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Ball-and-socket joints
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Basalt lava flow
1
Basaltic dike
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Big Bend National Park
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