| 11. | The first volcanic activity beginning 2 million years ago formed voluminous lava flows from fissure vents.
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| 12. | "' Lj�sufj�ll "'is a fissure vent system and central volcano on the Sn�fellsnes Peninsula in Iceland.
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| 13. | Cord�n Caulle evolved during this time from being a shield volcano to a graben with fissure vents.
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| 14. | "' Vatnafj�ll "'is a long, wide basaltic fissure vent system that is located southeast of Hekla, Iceland.
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| 15. | The " M�vatn fires " occurred between 1724 1729, when many of the fissure vents opened up.
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| 16. | Lava from the fissure vent tended to flow downhill toward the southeast, covering part of the fissure.
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| 17. | A fissure vent in the "'Fimmv�r�uh�ls "'region of southern Iceland, caused by the Norse god of thunder.
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| 18. | Max then comes across a fissure vent.
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| 19. | They discovered a fissure vent near the summit caldera a bit to the west of " Gu�nasteinn ".
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| 20. | Situated northwest of Armenian capital Yerevan, Aragats is a large volcano with numerous fissure vents and adventive cones.
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