Continental rifts - PowerPoint PPT Presentation

Chapter 2

Chapter 2. Key concepts: Continental drift Seafloor spreading Convergent plate boundary Divergent plate boundary Transform-fault plate boundary Why do plates move? Magnetic anomalies Pangaea. Which force(s) create earthquakes and volcanoes?. Gravity Electro-magnetism Nuclear forces.

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Plate Tectonics

Plate Tectonics. Continental Drift . Wegener’s Continental Drift Hypothesis stated that the continents had once been joined to form a single supercontinent (Pangaea) . Wegener proposed that Pangaea began to break apart 200 million years ago and formed the present landmasses.

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