Warm Up 9/2

1. Warm Up 9/2 Alfred Wegner was known for his hypothesis of _________________ __________. Why was Wegner’s hypothesis rejected?

2. Plate Tectonics Chapter 9, Section 2

3. Earth’s Major Plates • According to the plate tectonic theory, the uppermost mantle, along with the overlying crust, behaves as a strong, rigid layer; the lithosphere • Plate Tectonics – the theory that proposes that Earth’s lithosphere consists of individual plates that interact in various ways producing earthquakes, volcanoes, mountains, and the crust itself • Plate – segment of the lithosphere, which moves and continually changes shape • The plates move relative to each other at a very slow rate ~5 cm/yr (about the same rate your fingernails grow!) • The movement is driven by convection currents deep within Earth

4. Earth’s Major Plates

5. Concept Check • What is plate tectonics? • A theory that states that Earth’s rigid outer shell is broken into plates made up of the crust and upper mantle, also known as the lithosphere. A plate moves as a unit with respect to the surrounding plates.

6. Types of Plate Boundaries • The three main types of boundaries are convergent, divergent, and transform fault boundaries • Divergent Boundaries – two plates moving apart and producing new lithosphere • Convergent Boundaries – two plates move together and destroy old lithosphere • Transform Boundaries – two plates grind past each other without the production or destruction of lithosphere

7. Types of Plate Boundaries

8. Assignment • Chapter 9 Assessment • # 1 – 31 p. 275 – 276 • # 1 – 8 p. 277 (Sorry!!)

9. Create a Plate Boundaries Poster • Include the 3 types of boundaries • Divergent • Convergent • Transform • Color • Descriptions of each – 1 sentence