Platetectonics.pptx - Theory of Plate Tectonics Plate...

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Theory of Plate Tectonics Plate Tectonics Plate Boundaries Causes of Plate Tectonics
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Plate Tectonics
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What is Plate Tectonics The Earth’s crust and upper mantle are broken into sections called plates Plates move around on top of the mantle like rafts
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What is the Lithosphere ? The crust and part of the upper mantle = lithosphere 100 km thick Less dense than thematerial below it so it “floats”
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What is the Asthenosphere ? The plastic layer below the lithosphere = asthenosphere The plates of the lithosphere float on the asthenosphere
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2 Types of Plates Ocean plates - plates below the oceans Continental plates - plates below the continents
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Questions... What is the theory of plate tectonics? What is the lithosphere? What is the asthenosphere? What is the connection between the two? What are the two types of plates?
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Plate Boundaries
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Convergent Boundaries Boundaries between two plates that are colliding There are 3 types…
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Type 1 Ocean plate colliding with a less dense continental plate Subduction Zone : where the less dense plate slides under the more dense plate VOLCANOES occur at subduction zones
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PLATE A PLATE B
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GUIDE QUESTIONS: 1.What type of plate is Plate A? What about Plate B? Why do you say so?
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GUIDE QUESTIONS: 2.Describe what happens to Plate A as it collides with Plate B? Why?
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