Intro Objective 10/5/11 Describe the three types of tectonic plate boundaries. What do you think...
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Transcript of Intro Objective 10/5/11 Describe the three types of tectonic plate boundaries. What do you think...
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IntroIntro
Objective 10/5/11Objective 10/5/11
Describe the three types of tectonic plate boundaries.
What do you think forms when two tectonic plates collide? What about when they divide?
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Plate BoundariesPlate Boundaries
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Plate BoundariesPlate Boundaries
• 3 Types of Boundaries
• Divergent boundary– Plates separate– 2 types
• Transform boundary– Plates slide past each
other– 1 type
• Convergent boundary– Plates collide– 3 types
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Plate BoundariesPlate Boundaries
• Continental-Continental divergence
• Rift valley
• Small volcanoes and earthquakes
• Example: African Rift Valley
• Deep valley that forms when 2 continental crusts move apart
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Div
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Div
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• Oceanic-Oceanic divergence
• Mid-ocean ridge
• Small volcanoes and earthquakes
• Example: Mid-Atlantic Ridge
• Underwater mountain chain’s and valley’s created by sea-floor spreading
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Plate BoundariesPlate Boundaries
• Transform Boundary
• Plates slide past each other
• Many earthquakes occur here
• Example: San Andreas Fault in CA
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Convergent BoundaryConvergent Boundary
• Oceanic-Oceanic collision
• Subduction
• Deep-ocean trench
• Creates huge volcanoes and earthquakes
• Example: Philippine islands
• Process of denser crust sinking down into mantle
• Valley/canyon created at subduction zone
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Oceanic – Oceanic CollisionsOceanic – Oceanic Collisions
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• Continental-Oceanic Collision
• Subduction of ocean plate
• Powerful volcanoes and earthquakes
• Forms mountains• Example: Andes
mountains in Chile
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Continental – Oceanic Continental – Oceanic CollisionsCollisions
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• Continental-Continental collision
• Creates HUGE mountains
• Both crusts move upward since neither are dense enough to sink into mantle
• Example: Himalayan Mtns. in India
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Continental – Continental Continental – Continental collisionscollisions
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• (Tectonic Plates Video - F4)
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Plate BoundariesPlate Boundaries
• Summary: Plates can collide into each other, separate and slide past each other creating the three types of plate boundaries: Divergent, Convergent and Transform. These boundaries create many different types of landforms on Earth.
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OutroOutro
Objective 10/3/11Objective 10/3/11
Explain that the earth's lithosphere is composed of many plates rather than one continuous piece
What do you think makes these plates move into each other?