Chapter 10, Section 2

1. Chapter 10, Section 2 Chapter 10, Section 2

2. Create a flashcard for each of the following terms (found on p.247 in your text book). • Plate tectonics • Lithosphere • Asthenosphere If you finish early, study your flashcards! Key Terms

3. The theory of Continental Drift led to the theory of PLATE TECTONICS. • PLATE TECTONICS explains how large pieces of the lithosphere, called plates, move and change shape. • Earth’s crust and the rigid, upper part of the mantle = LITHOSPHERE. This is the thin outer shell of Earth (like an Egg shell). • The lithosphere is broken into several pieces called TECTONIC PLATES. • The TECTONIC PLATES ride or float on the ATHENOSPHERE (part of the Earth’s mantle that is flowing slowly). Plate Tectonics

4. OCEANIC CRUST = dense, made of iron and magnesium-rich rock. • CONTINENTAL CRUST = low density, made of rock rich in silica. • Both kinds of crust are always moving with the tectonic plates they are riding on. Earth’s Crust

5. 15 major tectonic plates. Tectonic Plates

6. Frequent earthquakes in an area are evidence the 2 or more tectonic plates meet in that area. • Many volcanoes form from plate motion and help scientist identify plate boundaries. Earthquakes and Volcanoes

7. The upper and hard part of the Earth’s mantle is called the ______________________. • The two types of crust are continental and ____________. • Scientists have identified about ______ major tectonic plates. • Name one plate: _________________________________________________________________________________________________________________________________________________________________________________ Quick Check!!

8. Most of the dramatic changes in Earth’s crust---Volcanoes and Earthquakes---occur at Plate Boundaries. Types of Plate Boundaries

9. 2 plates move away from each other. • Magma from the athenosphere rises to the surface as the 2 plates move apart, the magma cools and creates new oceanic lithosphere(sea-floor spreading). Divergent Boundaries

10. 2 plates collide • 3 types of Collisions Convergent Boundary

11. Types of Collisions

12. 2 plates slide past each other horizontally • The edges of the plates scrape and jolt along each other. This motion is felt as Earthquakes. • No Magma is produced Transform Boundaries

13. Summary—Plate Boundaries

14. Name the 3 types of plate boundaries: ____________________________________________________________________________________________________________ • San Andreas fault is an example of a _________ boundary. • 2 plates moving apart is a _________ boundary. • Mid-Atlantic Ridge is causing South America and _______ to spread apart. Quick Check!!

15. Causes of Plate Motion

16. Heat from the Earth’s core heats the material in the Mantle. The heated material expands and becomes less dense therefore rising around the cooler, denser material above it. This cycle continues, this is called CONVECTION. Convection currents cause the tectonic plates above it to move. Mantle Convection

17. Plate Tectonics Video Clip

18. Make a 3-Flap Book showing each of the types of plate boundaries. For each flap include: --Definition/Description --Drawing --Real World Example Assessment

19. Daily Quiz