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