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Earth’s Changing Surface

Earth’s Changing Surface. Continental Drift. In 1912, German scientist, Alfred Wegener hypothesized that the continents of Earth move over time. He also proposed that all the continents were once massed together as one, called Pangaea. Evidence: Continents fit like puzzle pieces.

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Earth’s Changing Surface

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  1. Earth’s Changing Surface

  2. Continental Drift • In 1912, German scientist, Alfred Wegener hypothesized that the continents of Earth move over time. • He also proposed that all the continents were once massed together as one, called Pangaea. • Evidence: • Continents fit like puzzle pieces. • Fossils and rock layers match on different continents. • Glacial deposits were found near the equator. VIDEO

  3. Plate Tectonics • The Earth is divided into large plates composed of oceanic and continental crust. • Convection currents in the mantle of Earth causes sea-floor spreading. • Magma is forced to the surface and forms mid-ocean ridges between two plates. • As more magma rises the plates are pushed apart causing earthquakes, volcanoes and the formation of new mountain ranges. VIDEO

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