| 11. | The Calapooya Mountains are composed of volcanic rocks and newer sedimentary strata.
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| 12. | The source for the uranium was most likely local volcanic rock units.
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| 13. | It was volcanic rock with steep sides except for two landing places.
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| 14. | Some Rwandans are living on volcanic rock fields almost devoid of water.
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| 15. | Perlite is a volcanic rock " popped " at high temperature.
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| 16. | These volcanic rocks are of Tertiary age, and are mostly basalt.
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| 17. | Volcanic rocks of Kurile Lake range from basaltic andesite to rhyolite.
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| 18. | The cactus grows in volcanic rock on slopes, at altitudes around.
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| 19. | It also occurs in skarn, pegmatite and hydrothermally altered volcanic rocks.
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| 20. | Different kind of volcanic rocks can be found on Sharp Island.
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