| 31. | It also occurs in andesite volcanic rocks and altered ultramafic rocks.
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| 32. | The white stuff is likely perlite, which is expanded fragments of volcanic rock.
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| 33. | The resulting spectra provided more evidence that Barnacle Bill is a volcanic rock.
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| 34. | Trachytes are well represented among the Cenozoic volcanic rocks of Europe.
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| 35. | North of the Arizona border, the volcanic rock gives way to soft sand.
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| 36. | Artifacts of volcanic rock found at the site raised the Mayan possibility earlier.
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| 37. | Penguin Island looked gaunt in its dark grey color of volcanic rock and soil,
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| 38. | This quick erosion left many layers of volcanic rock exposed.
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| 39. | The volcanic rocks are now known as the Deccan Traps.
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| 40. | The soft stone was commonly basalt ( volcanic rock ).
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