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Plate Tectonics and Continental Drift TEKS Objectives:

Plate Tectonics and Continental Drift TEKS Objectives: (8.3)  Scientific processes. The student uses critical thinking and scientific problem solving to make informed decisions. The student is expected to:

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Plate Tectonics and Continental Drift TEKS Objectives:

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  1. Plate Tectonics and Continental Drift TEKS Objectives: • (8.3)  Scientific processes. The student uses critical thinking and scientific problem solving to make informed decisions. The student is expected to: • (A)  Analyze, review, and critique scientific explanations, including hypotheses and theories, as to their strengths and weaknesses using scientific evidence and information; • (E)  Connect Grade 8 science concepts with the history of science and contributions of scientists. • (8.14) Science concepts. The student knows that natural events and human activities can alter Earth systems. The student is expected to: • Predict land features resulting from gradual changes such as mountain building, beach erosion, land subsidence, and continental drift;

  2. Earth Systems

  3. Alfred Wagner 1910-1920 • Introduced The Theory of Continental Drift • Based theory on: • S. America & Africa • paleontology (the study of fossils) How do such large continents move?

  4. Arthur Holmes 1930’s • Introduced supportive theory: Currents of heat and thermal expansion in the Earth's mantle move continental plates. Convection!

  5. Great Global Rift Discovered! • After WW1 – Germany found a mountain-like ridge that ran through the Atlantic to the southwest of Africa. • Today it is call Mid-Atlantic Ridge

  6. Harry Hess 1950-1960 • Introduced supportive theory: sea-floor spreading! • Different plate movements gave us different land forms: • Divergent = divide (Mid-Atlantic Ridge) • Convergent = come together (Himalaya Mt. Range or Appalachian Mt. Range) • Transform = sliding (San Andres Fault)

  7. Seismology • Seismology is the study of earthquakes. • Check out the data below that shows where most earthquakes occur.

  8. Volcanology • The Pacific Ring of Fireis an area of frequent earthquakes and volcanic eruptions.

  9. Plate Tectonics Theory • Developed from • Puzzle piecing of the continents • Paleontology (the study of fossils) • Convection (movement of heat) • Great Global Rift (aka Mid-Atlantic ridge) • Sea-Floor Spreading • Seismology (the study of earthquakes) • Volcanology (the study of volcanoes)

  10. But…. • What if everything I told you was old and scientists have created a new theory? • This new theory is not completely accepted, but how easily do people accept change? • Keep in mind that our Earth is a celestial body and star characteristics might not be to far off. http://www.youtube.com/watch?v=VjgidAICoQI&feature=related http://www.newgeology.us/

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