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Warm-Up 10-8-14

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

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Warm-Up 10-8-14

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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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