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?

Plate BoundariesPlate Boundaries

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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• 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

• 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

• 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

• (Tectonic Plates Video - F4)

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.

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?