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Plate Tectonics

Plate Tectonics. Part Two: Sea Floor Spreading. TOC = “Sea Floor Spreading”. Objective:. TEKS 8.9A. Explain following about seafloor spreading theory: Whose idea and when presented Describe evidences to support What was the importance of this discovery What is reverse magnetism.

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Plate Tectonics

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  1. Plate Tectonics Part Two: Sea Floor Spreading

  2. TOC = “Sea Floor Spreading”

  3. Objective: TEKS 8.9A Explain following about seafloor spreading theory: • Whose idea and when presented • Describe evidences to support • What was the importance of this discovery • What is reverse magnetism

  4. Atlantic Ocean Growing ? Engage • Is the Atlantic Ocean growing? Explain • If it is, explain why Earth is not getting bigger. • If it is not, explain why volcanoes produce more land, yet the oceans still cover most of Earth.

  5. Atlantic Ocean Growing ? Explore • Demo (Click)

  6. Atlantic Ocean Growing ? Explore In journal draw picture of model from video and label the parts. Write the question OR restate question in answer • How does this model seafloor spreading • What do the marks on the paper represent • Based on this model, where is the oldest rock on the seafloor found

  7. Evidences Explain • Video(click here for you tube video) • Harry Hess develops Sea Floor Spreading Theory • Theory based on sonar (depth sounding device) • Discovered the Mid-Atlantic Ridge (mountain under water) • Newer rocks found in middle of ocean, older rocks found near continents • Earth crust recycled via method called subduction • Gave support to Wegener’s Continental Drift Theory

  8. Evidences Explain Wegener’s Continental Drift Theory + Hess’s Sea Floor Spreading Theory = Plate Tectonic Theory

  9. Reversed Magnetism ? Elaborate We know a compass will point to the north pole. Do you think it will point to the south pole?(click)

  10. Closure: TEKS 8.9A Write the question OR restate question in answer Who developed theory of Sea Floor Spreading? How did he support his theory? What was the importance of this discovery? What is reverse magnetism?

  11. Closure TEKS 8.9A TOC: “Plate Tectonic Concept Map” Working in pairs create a concept map to include following ideas. Alfred Wegener Plate Tectonics Continental Drift Harry Hess Sea Floor Spreading Evidences of continental drift Evidences of sea floor spreading

  12. Concept Map - How to Start with one word or idea everything falls under Like in this case Plate Tectonics Then what are key points of plate tectonics Yep, ur right – Continental Drift - Sea Floor Spreading Under Continental Drift, what do we know? And so on

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