PLATE BOUNDARIES. Instructional Goals Explain how each of the three plate boundaries are formed ...
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PLATE BOUNDARIES
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Instructional Goals
Explain how each of the three plate boundaries are formed
Predict the resulting landforms from each boundary
Identify examples of plate boundaries
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What do you know?
What do you know about earthquakes, mountains, etc?
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Plate Boundaries
The place where two plates meet is called a plate boundary
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Types of Plate Boundaries
Divergent Convergent Transform
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Divergent Boundaries
Plates moving away from each other When do divergent boundaries occur?
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Examples of Divergent Boundaries Mid-Atlantic Ridges Iceland (rift area) Red Sea Lake Baikal East African Rift
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Convergent Boundaries
Plates are moving towards one another (colliding)
Destroys crust What happens at a convergent boundary
depends on the plates
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Oceanic-Continental
- oceanic plate subducts because it is more dense
- examples: Andes Mountains Mount St. Helens (Juan de Fuca subducts
beneath the North American plate)
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Oceanic-Oceanic
- oldest crust subducts - volcanic island chains - examples: Philippines Japan Aleutian Islands
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Continental-Continental
- neither plate subducts - forms mountains - Examples Himalayas Appalachians Rockies Alps
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Transform Boundary
- forms everywhere ridge is not a straight line
- two plates slide past each other - crust is conserved
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Examples
San Andreas Fault Pacific Plate is moving faster than
North American plate at a rate of about 2 cm per year
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http://www.learner.org/interactives/dynamicearth/plate.html
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0804/es0804page01.cfm?chapter_no=visualization
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How does it all connect?
Earth layers Moving Plates
Continental Drift Plate Boundaries
Divergent, convergent, transform fault Earthquakes, volcanoes and mountains
and things
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Journal
“Tectonic” comes from the Greek word tektonikos, which means “of a builder”. Why is this word appropriate for tectonic plates? In what ways are tectonic plates responsible for building/destroying features of the Earth’s surface?