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VOLCANOES. AA - a type of lava flow with a rough, fragmented surface. Active volcano - volcano currently erupting or has had recent activity. Crater -

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Presentation on theme: "VOLCANOES. AA - a type of lava flow with a rough, fragmented surface. Active volcano - volcano currently erupting or has had recent activity. Crater -"— Presentation transcript:

1 VOLCANOES

2 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.AniakchakAniakchak

3 VOCABULARY Dike - 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. Rainier Extinct volcano - a dead volcano. Ascension Island Ship Rock Hot Spot volcano - volcanoes related to persistent heat source in the mantle (Mantle Plume). YellowstoneYellowstone

4 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 Tower Nuee Ardente - a fast-moving, “glowing cloud” or better yet, glowing avalanche, of hot volcanic ash and gas; deadliest of all volcanic phenomena.

5 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.

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