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PS 2-7-08
Plate Tectonics
Big Question
• What part of the Earth moves and why
• Compare diverging boundaries,
converging boundaries and transform
boundaries
Oceanic meets Continental
crust
The west Coast of the US around
Seattle and Portland
West Coast
Ocean-vs-Continent
• More dense ocean crust is push beneath
Continental crust
When it is pushed deep enough it begins to
melt
The melted material is pushed upward,
supplies material for volcanos
Magma and Lava
• Magma
• Lava
Continental material meets
other continental material
The mountains between India and
China
Subduction zone –The Himalayas
Continent –vs-Continent
• Nothing is pushed down much, similar
density
• Build Mountains
• Keep building as long as pushing occurs
• No volcanos
Ocean-vs-Ocean
• All based on age of rock, the oldest
material is pushed under
• Creates volcanic islands, or island ars
Subduction zone - Japan
One final type of boundary
interaction
TRANSFORM BOUNDARY
Southern California
• San Andreas Fault
Transform
• Moves past each
other
• Not creating or
destroying material
• Earthquakes
Plate Tectonics
• Describes continental movement
• Describes why and how continents move
What is a plate?
• A plate is made up of a section of the
earth’s crust and lithosphere underneath it
• Lithosphere is brittle, so it breaks into
pieces under enough force
How do plates move?
• New crust and lithosphere is made at
diverging boundaries
• This new material pushes the old material
away
• The Asthenosphere bends to allow the
plates to move
Tectonic plates of the world
What happens to the islands that
enters into a Subduction zone?
Scraped off and added to the bigger
continent
The northern Californian coast
Some evidence about the land we sit on
Microplate Terrane
Review
• Plate Tectonics
• Diverging Boundaries
• Converging Boundaries
• Transform Boundaries
To sum up
• Plate Tectonics
What moves
Cause of motion
• Interactions between plates
Diverging Boundaries
Creation of Plates
Rift Valleys
Review
Converging boundaries
Destruction of plates
3 different scenarios
Volcanic activity
Mountain building
Transform boundaries
Move past each other
No overlap
Earthquakes
no volcanoes
Homework
• Worksheet:
– Do all multiple choice questions
– Question 2 and 3 critical thinking
Make your own world
• On a piece of paper, create a map of a
world of your design
• Divide up the world using at least 2
diverging and 2 converging boundaries
The rock cycle