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  • Continental Drift

  • What is continental drift?

  • What is continental drift?1912 Alfred WegenerHypothesized that-the continents are moving= Continental driftall continents once formed a supercontinent = Pangaea

  • Many pieces of evidence suggest that Pangaea existed

  • How do South America and Africa fit together?(Evidence #1) S. Americas east coast fits like a puzzle piece withAfricas west coast

  • How do South America and Africa fit together?

    Evidence #1South Americas east coast fits like a puzzle piece with Africas west coast.

  • Look at the two images.What do you noticeabout the mountainsin North America and Europe?

  • Look at the bottom picture.What do you noticeabout the mountainsin North America and Europe?The Appalachian Mtns. (USA) and the mountains in Europe once formed a single mountain range.(Evidence #2) The type of rocks in different continents are similar

  • What can past climates tell us?Evidence #3Continents show past changes in the climate

    Fossils of tropical plants in Antarctica, indicate a warmer, tropical climate at one time

    Rocks show that glaciers once formed on Pangaea

  • Evidence #4 Africa, South America, and Australia all have similar fossils of the fern, Glossopteris.(lighter colored area below)

  • How is the fossil evidence useful for proving Continental Drift? (discuss & write)

  • How do we know that continents are pushed apart?

  • How do we know that continents are pushed apart?Evidence #5 Seafloor spreading at mid-ocean ridges (1962 H. Hess)Rocks made in the Atlantic Ocean are younger (or newer) than the continents

    Heres how we know this-

    Crust furthest from the ridge has older sea-fossils

    Patterns in iron crystals (paleomagnetism) indicate that ocean crust began forming less than 160 million years ago

  • How many tectonic plates are there? Scientists have identified7 major plates and 14 smaller ones

  • How many tectonic plates are there? Scientists have identified7 major plates and many smaller onesSmithsonian

  • Where are volcanoes found?Write down one thing that you notice about where volcanoes occur

  • Where are volcanoes found?Write down one thing that you notice about where volcanoes occur

    Evidence #6: Volcanoes and earthquakes near plates

  • When did Pangaea break apart? During the Mesozoic Era, about 200 m.y.a.

  • Summary of evidence:#1 Continental coastlines fit together (Wegener)

    #2 The type of rocks in different continents are similar (Wegener)

    #3 Past changes in the climate can be explained by Continental Drift (Wegener)

    #4 The same plant & animal fossils are found on different continents (Wegener)

    #5 Seafloor spreading explains plate movement

    #6 Volcanoes & earthquakes indicate plate movement

  • Handout- Continental Drift Sequence

    A. Color each continent the same color in each picture of the sequence.

    B. Identify each continent and label them.

    C. On the back, describe what happens with the continents as time passes.

    D. Draw a prediction of where they will be in the future.Continents North America EurasiaSouth America AntarcticaAfrica IndiaAustralia

  • resourceshttp://www.plainedgeschools.org/swells/plate_tectonics.htmhttp://slohs.slcusd.org/pages/teachers/rhamley/Biology/Continental%20Drift/Tectonics.htmlhttp://geology.rutgers.edu/103web/Pangeabreakup/breakupframe.html

  • What is continental drift?1912 Alfred WegenerEvidence shows that-the continents are moving= Continental driftall continents once formed a supercontinent = Pangaea

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