Transcript Volcanoes and Plate Tectonics

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• Earthquake notes
• 5-2 Homework
Volcanoes and Plate
Tectonics
Section 9-2
What is a volcano?
• A weak spot in the
crust where
magma comes to
the surface.
• Magma at surface
= lava
Earth’s Active Volcanoes
Volcanoes at Divergent
Boundaries
• Volcanoes
form along the
mid-ocean
ridge, as lava
escapes from
cracks in the
ocean’s floor.
Volcanoes at Convergent
Boundaries
• Volcanoes
often occur
near plate
boundaries
as a result
of
subduction.
Volcanoes at Convergent
Boundaries
• Island Arcs
occur when
2 pieces of
oceanic
crust
collide.
Hot Spot Volcanoes
• Super hot
areas of the
mantle melt
through the
crust to form
Hot Spot
volcanoes.
Hot Spot Volcanoes
Hawaii
Hot Spot Volcanoes
Yellowstone
Let’s Review!
• What is a volcano?
• What is lava?
• Why do volcanoes form at
divergent boundaries?
• Why do volcanoes form at
convergent boundaries?
• Why do volcanoes form at hot
spots?
Homework
•Read 6-1
•6-1 R/R due Friday