| 41. | Basaltic volcanic rocks up to thick cover in east Greenland.
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| 42. | Tephra is a catchall term for fragments of volcanic rock and lava thrown airborne.
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| 43. | "It is not possible to make latrines in this volcanic rock, " he explained.
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| 44. | Kimberlite mines, which burrow into volcanic rock, require complex technology.
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| 45. | The island is little more than volcanic rock, and has a population of 45.
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| 46. | Johnson said the findings gave " more credence to the volcanic rock hypothesis ."
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| 47. | Volcanic rocks of Quaternary age are widespread in the area.
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| 48. | Nestled in a massive volcanic rock formation, it is perfect for a romantic evening.
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| 49. | The nuclear explosions take place within a shaft drilled into the underlying volcanic rock.
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| 50. | Weathered rhyodacite is main volcanic rock of the Capricorn Assemblage.
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