VolcanoesVolcanoes

Kim Lachler

Updated 11/14

NCES 6.E.2.2

Eruption typesEruption types

Eruption typesEruption types

Type 1Type 1

small amount of gas is small amount of gas is trapped undergroundtrapped underground

Not much pressure buildupNot much pressure buildup

Lava oozes out in a calm, Lava oozes out in a calm, steady flowsteady flow

Most gentle type of Most gentle type of eruptioneruption

Eruption typeEruption type

Type 2Type 2

Small buildup of gas causes a Small buildup of gas causes a noisy explosionnoisy explosion

Lava is thrown several hundred Lava is thrown several hundred feet in the airfeet in the air

Not as dangerous as some other Not as dangerous as some other typestypes

Most common on landMost common on land

Eruption typesEruption types

Type 3Type 3

Sticky magma plugs up a Sticky magma plugs up a volcano’s openingvolcano’s opening

Gas builds up, causing pressureGas builds up, causing pressure

Explosion can throw debris as high Explosion can throw debris as high as nine miles into the airas nine miles into the air

Smaller explosions can occur for Smaller explosions can occur for days, months, or years after the days, months, or years after the eruptioneruption

Type of eruptionType of eruption

Type 4Type 4

Magma plugs up a volcano’s openingMagma plugs up a volcano’s opening

Pressure builds up behind the plugPressure builds up behind the plug

Blast can throw debris more than 15 Blast can throw debris more than 15 milesmiles

into the airinto the air

Most dangerousMost dangerous

Parts of a mountain can be blown offParts of a mountain can be blown off

Lava typesLava types

AaAa

lava pours out quickly and forms a brittle crust lava pours out quickly and forms a brittle crust

as it continues to flow it cause the crust to tear as it continues to flow it cause the crust to tear into jagged piecesinto jagged pieces

Lava_on_Land_and_in_Water.mov

Lava typesLava types Pahoehoe Pahoehoe

lava pours out slowly like waxlava pours out slowly like wax

it is glassy with wrinklesit is glassy with wrinkles

Lava typesLava types

Pillow lavaPillow lava

forms when lava erupts underwater forms when lava erupts underwater

forms round lumpsforms round lumps

Lava typesLava types

Blocky lava Blocky lava

lava oozes out into heaps forming blocky lava oozes out into heaps forming blocky chunkschunks

Volcano typesVolcano types

Shield volcanoesShield volcanoes

large, broad, gently sloping sides, lava flows easilylarge, broad, gently sloping sides, lava flows easily

formed from build up of layersformed from build up of layers

Types_of_Volcanoes.movVolcanoe type.mov

Volcano typesVolcano types Cinder Cone volcanoesCinder Cone volcanoes

small, steep cones formed from lava that dropped small, steep cones formed from lava that dropped from the air after an explosive eruptionfrom the air after an explosive eruption

short lived explosionsshort lived explosions

Volcano typesVolcano types

Composite volcanoes (Stratovolcanoes)Composite volcanoes (Stratovolcanoes)

steep sided mountains, where plates collided. Has steep sided mountains, where plates collided. Has alternating layers of lava and rock.alternating layers of lava and rock.

Mt. Fuji, Japan

Volcano typesVolcano types

Fissure eruptions Fissure eruptions

oozes from cracks in the earth’s surface oozes from cracks in the earth’s surface

The_Ring_of_Fire.mov

BibliographyBibliography

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http://www.google.com/images?hl=en&q=volcanoes&um=1&ie=UTF-8&source=univ&ei=ZK6zTP_wH4S8lQfj3Yi8Cg&sa=X&oi=image_result_group&ct=title&resnum=4&ved=0CD4QsAQwAw, accessed 10/11/10, accessed 10/11/10

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