volcanic activity: what causes a volcano?. what is a volcano? the hot upper mantle part of the...

Volcanic Activity:

What causes a volcano?

What is a volcano?

The hot upper mantle part of the lithosphere escaping through the crust part of the lithosphere.

Where are volcanoes?

Subduction zones: Where one plate is pushed under another plate.

Where are volcanoes?

Subduction zones: Where one plate is pushed under another plate.

Divergent zones: two plates pulling apart and creating ridges.

Where are volcanoes?

Subduction zones: Where one plate is pushed under another plate.

Divergent zones: two plates pulling apart and creating ridges.

Hot spots: These can happen anywhere on the planet that the crust is weak and thin (even in the middle of a plate).

Volcano vocabulary:

Magma: Melted mantle beneath the surface of the Earth.

Volcano vocabulary:

Magma: Melted mantle beneath the surface of the Earth.

Lava: Magma that reaches the surface and is exposed to the atmosphere.

Volcano vocabulary:

Magma: Melted mantle beneath the surface of the Earth.

Lava: Magma that reaches the surface and is exposed to the atmosphere.

Vent: The path gas and magma use to escape the crust.

Types of eruptions:

Explosive: Happen when magma gets very thick from high Silica content and contains deadly gases.

Types of eruptions:

Explosive: Happen when magma gets very thick from high Silica content and contains deadly gases.– Pyroclastic flow: A mixture of hot gases (up to

800 degrees Celsius), ash, cinder, and bombs hurled from a volcano at speeds up to 200 km per hour.

Types of eruptions:

Explosive: Happen when magma gets very thick from high Silica content and contains deadly gases.– Pyroclastic flow: A mixture of hot gases (up to

800 degrees Celsius), ash, cinder, and bombs hurled from a volcano at speeds up to 200 km per hour.

Effusive: Dominated by lava flowing from the volcano onto the ground.

Types of volcanoes:

Composite Volcanoes

Types of volcanoes:

Composite Volcanoes Shield Volcanoes

Types of volcanoes:

Composite Volcanoes Shield Volcanoes Cinder Cones

Types of volcanoes:

Composite Volcanoes Shield Volcanoes Cinder Cones Spatter Cones

Types of volcanoes:

Composite Volcanoes Shield Volcanoes Cinder Cones Spatter Cones Complex Volcanoes