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Objective 10/5/11 Describe the three types of tectonic plate boundaries. Intro What do you think forms when two tectonic plates collide? What about when they divide? Plate Boundaries Plate 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 BEGIN FOLDABLE Plate Boundaries • ContinentalContinental divergence • Small volcanoes and earthquakes • Example: African Rift Valley • Rift valley • Deep valley that forms when 2 continental crusts move apart DRAW Divergent Boundary • 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 DRAW Plate Boundaries • Transform Boundary • Plates slide past each other • Many earthquakes occur here • Example: San Andreas Fault in CA DRAW Convergent Boundary • Oceanic-Oceanic collision • Creates huge volcanoes and earthquakes • Example: Philippine islands • Subduction • Process of denser crust sinking down into mantle • Valley/canyon created at subduction zone • Deep-ocean trench DRAW Oceanic – Oceanic Collisions • Continental-Oceanic Collision • Subduction of ocean plate • Powerful volcanoes and earthquakes • Forms mountains • Example: Andes mountains in Chile DRAW Continental – Oceanic Collisions • ContinentalContinental collision • Creates HUGE mountains • Both crusts move upward since neither are dense enough to sink into mantle • Example: Himalayan Mtns. in India DRAW Continental – Continental collisions • (Tectonic Plates Video - F4) Plate 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. Objective 10/3/11 Explain that the earth's lithosphere is composed of many plates rather than one continuous piece Outro What do you think makes these plates move into each other?
