MAY EXAM VOLCANO REVIEW

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)

Look at letter C. Which part of the volcano is the letter C pointing at? Is it the magma, crater, or lava?

Look at letter D. Which part of the volcano is letter D pointing at? Is it the crater, pipe, or magma chamber?

• ​A volcano is an opening on the surface of Earth and through which gasses and erupted materials pass through.

• ​The erupted material collects to create a cone shaped landform on the surface.

• It is a mountain made of lava, ash, or other materials from eruptions.

• VOLCANOES CAN COME IN 3 DIFFERENT STATE:

• ACTIVE: It could erupt at any time

• DORMANT: It has not erupted in 10.000 years but could do so again.

• EXTINCT: It has not erupted in the last 10.000 years and will not again.

By the end of this lesson, you will be able to explain what volcanoes are, how they are formed, and identify their parts.

Volcanic eruptions are constructive in that they add new rock to existing land and form new islands.

Volcanic eruptions can be destructive when an eruption is explosive and changes the landscape of and around the volcano. 

• MAGMA: It is molten rock under the crust.

• LAVA: It is magma that reaches Earth's surface.

• VENT: It is any opening at the Earth's surface through which magma erupts or volcanic gases are emitted.

• CINDER CONE: It is built from particles and blobs of congealed lava ejected from a single vent.

Most volcanoes occur along plate boundaries; an area in the Pacific Ocean where volcanoes are common is called the Ring of Fire.

Hawaii formed over a HOT SPOT as the tectonic plate moves new crust moves over the hot spot, where a new Hawaiian volcano (or island) can form