Volcano Formation

Volcanoes

How do they form?

Where Volcanoes Form

• Subduction Zone

• Mid - Ocean Ridge (Seafloor Spreading)

• Hot Spots

Multiple Choice

Subduction zones are the only places where volcanoes form on Earth.

• True

• False

Multiple Choice

Where can volcanoes form on Earth?

• hot spots

• subduction zones

• mid-ocean ridges

• all of these

Multiple Choice

What landform is created when magma reaches Earth's surface?

• trench

• canyon

• earthquake

• volcano

Plates Converge/Collide (Video)

• Oceanic Pushes Under Continental

• Subduction Zone

Mount St. Helens

• Juan de Fuca Plate Subducts North American Plate

• Cascade Mountain Range

Mount Fuji (Video)

• Pacific & Philippine Plates Subduct Eurasian Plate

• Tallest Mountain in Japan

Multiple Choice

Which type of plate sinks into the mantle at a subduction zone?

• oceanic

• continental

Multiple Choice

What happens to the oceanic plate as it pushes into the mantle?

• it cools and freezes

• it condenses into a liquid

• it melts and forms magma

• it evaporates into the air

Hot Spots

• Hot Magma Burns a Hole in the Plate

• Creates an Opening for Magma to Escape to Earth's Surface

Hawaiian Islands

• Hot Plume of Magma Burns Hole in Crust

• Magma Rises and Hardens Into New Rock

• Plate Moves and Another Hole is Burned

• Reason for Chain of Islands

Yellowstone (Video)

• Plume of Hot Magma Under Crust

• Last Eruption Formed Large Caldera

• Series of Calderas from Movement of Plate

• 
  

Multiple Choice

What term represents a plume of magma burning a hole in Earth's crust?

• hot spot

• warm wound

• hot plate

• hot potato

Multiple Choice

What causes a chain or series of volcanoes or calderas to form at a hot spot?

• movement of rivers

• movement of plates

• movement of wind

• movement of waves

Multiple Choice

What does magma do once a hot spot burns a hole in the crust?

• sinks back into the mantle

• pulls mountains underground

• rises to the surface, cooling into solid rock

Plates Diverge

• Plates Pull Apart

• Magma Rises Between the Plates and Hardens into New Rock

• Mid-Ocean Ridges - Seafloor Spreading

• Rifts - Valleys Dotted with Volcanoes

Mid-Atlantic Ridge

• Underwater Volcanoes Where Plates Pull Apart

• Add New Land to Ocean Floor

• Plates Continue to Spread - Seafloor Spreading

Rifts (Video)

• Plates Pull Apart on Land

• Creates Valleys Dotted with Volcanoes

• 
  

Multiple Choice

Underwater volcanoes are constructive.

• True

• False

Multiple Choice

When plates pull apart at divergent plate boundaries, what rises between them?

• iron

• plants

• magma

• sea monsters