VolcanoesVolcanoes

Parts of a volcano.Types of volcanoes.Composite – Shield volcanoes.Volcano vocabulary.

Volcano parts

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CompositeComposite Shield

Volcanic

structureSteep slopeSteep slope

Broad, gentle slope

Composite Shield

Tectonic

environmentConvergent b.(subduction

zones)

Divergent b.+

hot spots

Composite Shield

Rock type andesite basalt

Composite Shield

Lava

temperature 800º C 1100º C

Composite Shield

Lava

viscousityHigh Low

Composite Shield

Eruptive

styleExplosive Quiescent

Composite Shield

Examples Mt St HelensMauna Loa

(Hawaii)

Lava

http://vi.sualize.us/view/8f3a44bcfc33726c4d105d3e31e21831/

Molten rock that erupts from a Molten rock that erupts from a volcano that solidifies as it cools.volcano that solidifies as it cools.

LavaLava

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A light, porous, glassy lava, A light, porous, glassy lava, used in solid form as an used in solid form as an

abrasive and in powdered form abrasive and in powdered form as a polish and an abrasive.as a polish and an abrasive.

PumicePumice

A round or pear-shaped mass A round or pear-shaped mass of volcanic rock, solidified from of volcanic rock, solidified from

molten lava that has been molten lava that has been thrown into the airthrown into the air

BombBomb

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Fragments of lava or rock Fragments of lava or rock smaller than 2 mm in size that smaller than 2 mm in size that

are blasted into the air by are blasted into the air by volcanic explosions.volcanic explosions.

AshAsh

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Molten rock beneath Earth's surface.

MagmaMagma

Mouth of a volcano - surrounds Mouth of a volcano - surrounds a volcanic vent. a volcanic vent.

CraterCrater

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rocks formed from the solid fragments ejected during a

volcanic eruption

PyroclastsPyroclasts

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A broad volcano built up from A broad volcano built up from the repeated nonexplosive the repeated nonexplosive

eruption of basalt to form a low eruption of basalt to form a low domedome

Shield volcanoShield volcano

A flow of pyroclastic material A flow of pyroclastic material mixed with watermixed with water on the flanks on the flanks

of a volcanoof a volcano

LaharLahar

http://www.thefreedictionary.comhttp://www.thefreedictionary.com