What Is a Volcano?

Volcanoes

What is a volcano?

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Divergent Plate Boundaries:

Most divergent plate boundaries are at the bottom of the oceans, causing most of the volcanic activity to be ______, thus forming ______.

Convergent Plate Boundaries

•  When two plates (usually an oceanic and continental plate) collide, causing the one plate to submerge under the other plate (called subducting). In the case of oceanic-continental, a deep trench just off shore is formed.

•  When the viscous magma, reaches the surface, a volcano is formed.

•  *This is what caused the ______volcanoes.*

Hots Spots

Located over a mantle plume, where the convection of the Earth’s mantle creates a column of hot material that rises until it reaches the crust. Pipes form in the crust, which vents ______.

Ring of Fire

·  Result of plate tectonics and the movement and hitting of crustal plates.

·  Area where large numbers of earthquakes and volcanic eruptions occur in a ______km horseshoe shape. Contains _____ volcanoes, with over ____% of worlds active and dormant volcanoes.

What are the 3 types of Volcanoes?

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2.______

3.______

Write the definition and match the picture.

Shield Volcano:

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Cinder Cone Volcano:

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Composite Volcano:

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What is the name of this volcano? What kind of volcano is this?

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Diamond Head

Early sailors mistakenly thought glistening calcite crystals inside the tuff rocks were ______, leading to the incorrect name. Diamond Head formed when ______, causing large explosions that threw exploded magma particles (tuff) into a ______.

Mt Shasta

Over the last ______years, Mt. Shasta has erupted on average once every _____ years. During the ______years the volcano has erupted about once every ______years. The most recent eruption may have occurred in 1786 A.D.

Mt. Kohala

Kohala is the oldest of the subaerial volcanoes that make up the Island Of Hawaii. Kohala is considered to be extinct ______

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