get out: earthquake notes 5-2 homework. volcanoes and plate tectonics section 9-2
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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
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