HOMEWORK Read Section 9.2 Page 198 Q 1-3.

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Presentation transcript:

HOMEWORK Read Section 9.2 Page 198 Q 1-3

How and Where Volcanoes Form Section 9.1 Write what is in RED on the handout provided

Quick Review What is magma? Why does magma rise? At what kind of plate tectonic boundary/ boundaries do we find volcanoes? Why do volcanoes form here?

Definition of Volcano Volcano: Both an opening in Earth’s crust through which molten rock, gases and ash erupt and to the landform that develops around this opening

Magma Formation 1. Decreasing pressure can lower the melting temperatures of materials in the asthenosphere (ex. Rift valley/mid-ocean ridge) 2. Increasing temperatures can cause materials in the astenosphere to melt. (ex. Hot spot) 3. Increasing water in the asthenosphere can lower melting temperatures (ex. Subduction boundaries)

Rise to the Top Magma tends to rise to the surface because it is less dense than the solid material surrounding it The traits of the magma and the rate at which is rises depends on the amount of silica

Please make this chart in your notes Volcano Location Reason Volcano Formation Special Notes Examples

Subduction Boundary Divergent Boundary Hot Spot Row 1 Volcano Location Reason Volcano Formation Special Notes Examples Subduction Boundary Divergent Boundary Hot Spot

Collision between Oceanic/Continental Or Oceanic/Oceanic Row 2 Volcano Location Reason Volcano Formation Special Notes Examples Subduction Boundary Collision between Oceanic/Continental Or Oceanic/Oceanic Divergent Boundary High temperature + low pressure = lots of magma Hot Spot Hot molten magma from deep within the Earth rises up through the crust and reaches the surface

On plate that does not sink Row 3 Row 4 Row 5 Volcano Location Reason Volcano Formation Special Notes Examples Subduction Boundary Collision between Oceanic/Continental Or Oceanic/Oceanic On plate that does not sink Divergent Boundary High temperature + low pressure = lots of magma Where the plates separate Hot Spot Hot molten magma from deep within the Earth rises up through the crust and reaches the surface In the middle of plates away from plate boundaries

oceanic/oceanic, forms “VOLCANIC ARC” Row 4 Volcano Location Reason Volcano Formation Special Notes Examples Subduction Boundary Collision between Oceanic/Continental Or Oceanic/Oceanic On plate that does not sink oceanic/oceanic, forms “VOLCANIC ARC” Divergent Boundary High temperature + low pressure = lots of magma Where the plates separate Most of these volcanoes are underwater Hot Spot Hot molten magma from deep within the Earth rises up through the crust and reaches the surface In the middle of plates away from plate boundaries Hot spots do not move, but the crust does

O/C: Cascades in California O/O: Aleutians in Alaska Row 5 Volcano Location Reason Volcano Formation Special Notes Examples Subduction Boundary Collision between Oceanic/Continental Or Oceanic/Oceanic On plate that does not sink oceanic/oceanic, forms “VOLCANIC ARC” O/C: Cascades in California O/O: Aleutians in Alaska Divergent Boundary High temperature + low pressure = lots of magma Where the plates separate Most of these volcanoes are underwater Mid-ocean ridge, Iceland Hot Spot Hot molten magma from deep within the Earth rises up through the crust and reaches the surface In the middle of plates away from plate boundaries Hot spots do not move, but the crust does Hawaiian Islands, Canary Islands, Yellowstone