Volcanoes Review 2023

Volcano

(a weak spot in the Earth’s crust where magma comes to the

surface)

Review: Volcanoes

forms along

Subduction Zones

(where dense crust slide under less dense crust creating

magma that rises up to the surface)

Forms along convergent ( ) , divergent ( ), and hotspot boundaries

Magma - melted rock underground / Lava - melted rock that flows on the surface

Multiple Choice

Most Earthquakes and Volcanoes can be found....

• along the coast of Anarctica

• along plate boundaries

• in the united States

Multiple Choice

This is the name for the chain of volcanoes and earthquakes around the edge of the Pacific Plate.

• The Subduction Zone

• The Ring of Fire

• The Seismic-Tectonic Area

Multiple Choice

What kind of plate boundary is shown here?

• divergent

• convergent

• transform

Multiple Choice

What kind of plate boundary is shown here?

• divergent

• convergent

• transform

Multiple Choice

What kind of plate boundary is shown here?

• divergent

• convergent

• transform

Multiple Choice

The area where the ocean plate slides underneath the land plate, forming magma (and possibly a volcano) is called the ____.

• moho

• subduction zone

• epicenter

Multiple Choice

Hot melted rock that forms underground near the subduction zone is called ___.

• lava

• sedimentary rock

• igneous rock

• magma

Multiple Choice

What is magma called when it reaches the surface of Earth?

• Lava

• viscosity

• toxic gas

Review: Volcanoes

Parts of A Volcano

vent

Magma
chamber

pipe

Quiet

-Thin basaltic magma/lava (flows
easily and does not clog up the pipe
and vent)

-Low in silica

Types of Eruptions

Explosive

-Thick granitic magma/lava (flows
slowly and clogs up the pipe and
vent - builds pressure)

-High in silica

Multiple Choice

How much ___ that is in a volcano's magma helps to decide whether it will be explosive or quiet.

• silica

• rock

• air holes

• soil

Match

Match the following

• Thick, granitic magma makes

• Thin, basaltic magma makes

• Volcano type that tends to erupt quietly

• Volcano type that tends to erupt loudly

explosive eruptions

quiet eruptions

shield

composite

• explosive eruptions

• quiet eruptions

• shield

• composite

Multiple Choice

True or False: The more silica a volcano has in its magma, the quieter it will erupt.

• true

• false

3 Main Types of Volcanoes

Shield

-Non explosive

-Made mostly of thin,
basaltic lava flows

-Large, island forming (Ex.
The Hawaiian Islands)

Composite

-Most common type on Earth

-Has the classic cone shape

-Very explosive - made mostly
of thick, granitic lava flows

-Has alternating layers of lava
flow and pyroclastic material

CInder Cone

-Tend to be smaller

-Can be composite or shield

-Tall, steep sides

-Lava is slightly thicker than the
shield (can explode out cinders)

3 Main Types of Volcanoes

Shield

-Non explosive

-Made mostly of basaltic lava
flows

-Large, island forming (Ex.
The Hawaiian Islands)

Composite

-Most common type on Earth

-Has the classic cone shape

-Very explosive

-Has alternating layers of lava
flow and pyroclastic material

CInder Cone

-Tend to be smaller

-Can be composite or shield

-Tall, steep sides

-Lava is slightly thicker than the
shield (can explode out cinders)

Match

Match the volcano to its descriptions?

• Erupt quietly - has dark basaltic magma

• Has tall steep sides

• Erupt loudly - has light grinitic magma

Shield

Cinder Cone

Composite

• Shield

• Cinder Cone

• Composite

Match

Match the volcano to its descriptions?

• Is broader and wider than it is tall

• Magma/lava is thinner than composite but thicker than shield

• Most common type of volcano in the world

Shield

Cinder Cone

Composite

• Shield

• Cinder Cone

• Composite

Match

Match the volcano to its descriptions?

• Forms islands like Hawaii

• Throws out chunks of flaming debris called cinders.

• Most explosive type

Shield

Cinder Cone

Composite

• Shield

• Cinder Cone

• Composite

Match

Match the volcano to its descriptions?

Shield

Cinder Cone

Composite

• Shield

• Cinder Cone

• Composite