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