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Unformatted text preview: Plate Tectonics (Cont’d) 17:14 Convergent: Continent – Continent • One plate carrying a continent subducting under another • Continents are too buoyant to subduct • Result: compression, uplift, mountain building • Hazards – earthquakes Transform Boundaries • Plates slide past each other • Some deformation. little or no melting • Hazards – shallow, sometimes strong earthquakes o Ex. San Andreas Fault Pre-Plate Tectonic Ideas (Hypotheses) • Sinking of sea-floor along continents from weight of sediments o Edge of continents buckle and create mountains • Shrinking and cooling Earth o Cracking and wrinkling, causes mountains o Volcanoes not considered important • Expanding Earth o Pulls crust apart Continental Drift • Alfred Wegener o German Meteorologist o Noted fit of South America and Africa o Noted similar rocs and fossils on both continents Wegener and Continental Drift • 1912 and 1915 presented his hypothesis of “Continental Drift” •...
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- Spring '08
- Plate Tectonics, Alfred Wegener, continents, midocean ridges