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Understanding Continental Drift Theory: Wegener's Evidence and Missing Mechanism

Explore Alfred Wegener's continental drift theory, the supercontinent, and the density of objects, along with the evidences supporting his theory and the missing mechanisms. Delve into mid-ocean ridges, sea-floor spreading, and paleomagnetism as crucial components. Get insights into Earth's magnetic field reversals and the formation of new ocean floor pushing continents apart.

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Understanding Continental Drift Theory: Wegener's Evidence and Missing Mechanism

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  1. Warm-Up 10-8-14 Who is responsible for the continental drift theory? The supercontinent is called? The mass of the box is 32 gram. What is the density of the box? 4. List the 4 evidences Wegener used to support his theory 2 cm 2 cm 4 cm Agenda Turn in lab continental drift Notes Chapter 10-2 Chapter 10 vocab Homework Finish vocabulary

  2. Chapter 10-2Wegener’s Missing Mechanism • Mid-ocean ridges – undersea mountain ranges. Formed when magma rises from mantle to the crust

  3. Wegener’s Missing Mechanism • Sea-Floor Spreading – occurs along mid-ocean ridge, new ocean floor forms and pushes the continents away from each other

  4. As the sea-floor spreads…

  5. Some rocks acquire magnetic properties when they cool and solidify Provided evidence for sea floor spreading Paleomagnetism

  6. Paleomagnetism One side of the sea-floor becomes a mirror image of the other side.

  7. Paleomagnetism • As sea floor spread the magnetic field alternate between each strip of land • + is normal and – is reversed magnetic field

  8. Paleomagnetism • Earth’s magnetic field may have been reversed many times due to the reversal in the ocean floor

  9. Chapter 103 columns Vocabulary

  10. Assignments • Notes Summary • Chapter 10 vocabulary

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