Post on 12-Jan-2016
VOLCANOES
AA - a type of lava flow with a rough, fragmented surface.
Active volcano - volcano currently erupting or has had recent activity.
Crater - bowl-shaped depression in summit of volcano, formed by ejection of rock.
VOCABULARY
Caldera - gigantic basin at summit of volcano, formed by magma removal during eruption.
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VOCABULARYDike - a pipe-like structure radiating out from the neck; feeds lava to the volcano.
Dormant volcano - volcano not presently erupting but is likely to do so in the future.
Mt. RainierMt. RainierMt. RainierMt. Rainier
Extinct volcano - a dead volcano.
Ascension Ascension IslandIsland
Ascension Ascension IslandIsland
Ship RockShip RockShip RockShip Rock
Hot Spot volcano - volcanoes related to persistent heat source in the mantle (Mantle Plume).
YellowstonYellowstonee
YellowstonYellowstonee
VOCABULARY
Lava - magma that has reached the surface.
Magma - molten rock under the surface.
Neck - a vertical remnant of a former volcanic vent, formed by hardened magma.
Devils Devils TowerTowerDevils Devils TowerTower
Nuee Ardente - a fast-moving, “glowing cloud” or better yet, glowing avalanche, of hot volcanic ash and gas; deadliest of all volcanic phenomena.
VOCABULARY
Pahoehoe - a type of lava with a smooth surface.
Pyroclastic Flow - “broken fire”; any heated mixture of ash and pumice “hugging” the flanks of a volcano.
Ring of Fire - region of mountain building, earthquakes and volcanoes which surround the Pacific Ocean.
Volcano - an opening in the Earth’s surface where magma, gases and ash are expelled.