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A volcano is an opening in the Earth’s crust where lava comes out
Volcanoes can be found in 3 general locations 1. Divergent Boundaries 2. Subduction boundaries 3. Hot Spots
At divergent boundaries, volcanoes are created as the plates slide apart. Iceland is a good example.
When one plate subducts under another, a volcano is created. A good example is Mt. Fuji in Japan, Mt. St Helens in Washington and Aleutian islands in Alaska
Hot Spots are volcanoes that form in the middle of a tectonic plate. Hawaii is an example. As the plate moves, the hot spot stays in the same place, so a chain of islands is often created.
There are 3 kinds of volcanoes 1. Shield Cone 2. Cinder Cone 3. Composite Cone
Shield Cone volcanoes are not very tall and formed by layers of lava. Quiet Eruptions
Steep Volcano with explosive eruptions. Explosive eruptions caused by gas. Formed by layers of volcanic rock
Made of alternating layers of lava and rock Alternates in explosive eruption and quiet eruptions AKA Stratocones
Mafic lava – dark, no gas, not explosive, thin Felsic lava – light, lots of gas, explosive, thick Pahoehoe – ropey cooled lava, usually from mafic lava Aa – thick, blocky cooled lava from felsic lava
Vent – name of actual opening of volcano Crater – surrounding area around vent. Caldera – a collapsed vent; after a volcano explodes, a huge opening left over from explosion.
Volcanoes. Formed at Plate Boundaries Ring of Fire!
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Bell Ringer Wednesday 12/2/09 Explain P waves, S waves, and L waves? At what plate boundaries can volcanoes occur?
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CONTINENTAL divergence Ocean- Continent Convergence Ocean Divergence Ocean-Ocean Convergence.
Volcanoes Volcanoes occur most frequently at plate boundaries. Some volcanoes occur in the interior of plates in areas called hot spots. Most of Earth’s.
Volcano Make up Bellwork. Bellwork 1.A ______ is mountain made up of layers of lava and ash 2.The _____________ is a chain or ring of volcanoes around.
3 TYPES OF VOLCANOES. SHEILD HOW DO THEY FORM? Thin layers of lava pour out a vent and harden on top of previous layers.
VOLCANOES ERUPTING MOUNTAINS. VOLCANOES What is a volcano? What is a volcano? A volcano is a mountain caused by erupting lava from the mantle. A volcano.
volcanism:any activity that includes the movement of magma toward the surface of the Earth volcano: place where magma reaches the surface.
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Volcanoes. 7.1 Volcanoes and Plate Tectonics Magma – hot liquid rock Volcanism – movement of magma toward suface Lava – magma on the surface Vent.
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By: Paige Holmes 3/16/10. Thin layers of lava pour out of a vent and harden on top of previous layers. This lava creates shield volcanoes. Shield volcanoes.
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Volcanism. Mauna Loa, Hawaii Mt Pelee, Martinque Mt St Helens, WA 1981.
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