Intro Objective 10/5/11 Describe the three types of tectonic plate boundaries. What do you think forms when two tectonic plates collide? What about when

IntroObjective 10/5/11Describe the three types of tectonic plate boundaries.What do you think forms when two tectonic plates collide? What about when they divide?

Plate Boundaries

Plate Boundaries3 Types of BoundariesDivergent boundaryPlates separate2 typesTransform boundaryPlates slide past each other1 typeConvergent boundaryPlates collide3 types

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Plate BoundariesContinental-Continental divergence

Rift valleySmall volcanoes and earthquakesExample: African Rift Valley

Deep valley that forms when 2 continental crusts move apart

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Divergent Boundary

Oceanic-Oceanic divergence

Mid-ocean ridgeSmall volcanoes and earthquakesExample: Mid-Atlantic RidgeUnderwater mountain chains and valleys created by sea-floor spreading

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Plate BoundariesTransform BoundaryPlates slide past each otherMany earthquakes occur hereExample: San Andreas Fault in CA

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Convergent BoundaryOceanic-Oceanic collision

Subduction

Deep-ocean trenchCreates huge volcanoes and earthquakesExample: Philippine islands

Process of denser crust sinking down into mantleValley/canyon created at subduction zone

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Oceanic Oceanic Collisions

Continental-Oceanic CollisionSubduction of ocean platePowerful volcanoes and earthquakesForms mountainsExample: Andes mountains in Chile

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Continental Oceanic Collisions

Continental-Continental collisionCreates HUGE mountainsBoth crusts move upward since neither are dense enough to sink into mantleExample: Himalayan Mtns. in India

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Continental Continental collisions

(Tectonic Plates Video - F4)

Plate BoundariesSummary: 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.

OutroObjective 10/3/11Explain that the earth's lithosphere is composed of many plates rather than one continuous pieceWhat do you think makes these plates move into each other?

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