Types of Volcanoes

Types of Volcanoes

What make a volcanoes Violent?

Factors that determine an eruption

• Amount of water vapor

• How much silica

Types of magma

• High silica

• low silica

Quiet eruptions

• Low silica magma

• Basaltic magma-more fluid

• less trapped gasses

Explosive Magma

• Silica rich

• Granitic magma

• This magma is thicker causing it to stick and build pressure beneath it

Shield Valcano

• Spread out in flat layers

• E.G. Hawaii

Cinder Cone Volcano

• explosive eruption throw little pieces of lava and rock in the air called Tephra

• This forms tall steep volcano that is loosely packed

Composite Volcanoes

• alternating layers of tephra and slow-flowing magma

• between eruption that are quiet and explosive

Multiple Choice

What kind of magma is runny and flows quietly down a hill.

• Basaltic

• Granitic

Multiple Choice

What kind of magma causes violent eruptions?

• Basaltic

• Granitic

Multiple Choice

What are the two factors that influence an eruption

• water vapor and silica

• CO2 and silica

• CO2 and water vapor

Multiple Choice

What type of magma is thick and causes gasses to build up in a valcano?

• Basaltic

• Granitic

Multiple Choice

A flat dome shaped valcano that is made of layers of runny lava.

• Shield valcano

• composite volcano

• Cinder cone volcano

Multiple Choice

A volcano made of loosly packed tephra.

• shield volcano

• composite volcano

• cinder cone volcano

Multiple Choice

Volcano made of layers of alternating tephra and runny lava.

• shield volcano

• composite volcano

• cinder cone