| 11. | It is also found around some types of volcanic vents.
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| 12. | Several early Paleocene volcanic vent from which the flows erupted.
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| 13. | Secondary volcanic vents may form above the ring fracture.
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| 14. | These lava flows originated from the mountain's flat-topped summit and volcanic vents on its flanks.
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| 15. | Two days after the earthquake Cord�n Caulle, a volcanic vent close to Puyehue volcano, erupted.
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| 16. | Because these four areas are well apart, each area probably has its own volcanic vents.
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| 17. | It is formed by the weathering and decomposition of pyrite commonly near or in volcanic vents.
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| 18. | The goal was to reveal for the first time the inner workings of such volcanic vents.
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| 19. | This first recorded eruption of Cerro Azul was effusive, and formed the volcanic vent at Quizapu.
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| 20. | Derrick Cave began as an open channel of lava flowing south from a large volcanic vent.
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