2. The Theory of Plate Tectonics Chapter 4 Section 5

3. Standards S 6.1c Students know lithosphere plates that size of continents and oceans move at rates from centimeters per year in response to movements in the mantle. S 6.1c Students know lithosphere plates that size of continents and oceans move at rates from centimeters per year in response to movements in the mantle.

4. Anticipatory Set Have you ever dropped a hard boiled egg? Have you ever dropped a hard boiled egg? What happened? What happened? It should of cracked into a million pieces. It should of cracked into a million pieces. This is an example of the Earth’s lithosphere. This is an example of the Earth’s lithosphere. It is broken into jagged pieces. It is broken into jagged pieces.

5. Vocabulary Plate Plate Plate tectonics Plate tectonics Fault Fault Spreading boundary Spreading boundary

6. Vocabulary Rift valley Rift valley Colliding boundary Colliding boundary Sliding boundary Sliding boundary

7. The Theory of plate tectonics explains the formation, movement and subduction of Earth’s plates. The Theory of plate tectonics explains the formation, movement and subduction of Earth’s plates. Constantly moving Constantly moving Most geologists think that the movement of Earth’s plates is caused by convection currents in the mantle. Most geologists think that the movement of Earth’s plates is caused by convection currents in the mantle. A rift valley forms at a spreading plate boundary. A rift valley forms at a spreading plate boundary. Old oceanic crust is more dense than new oceanic crust because it is cool. Old oceanic crust is more dense than new oceanic crust because it is cool.

8. The geological theory that states that pieces of Earth’s lithosphere are in constant, slow motion is the theory of plate tectonics. The geological theory that states that pieces of Earth’s lithosphere are in constant, slow motion is the theory of plate tectonics. A collision between 2 pieces of continental crust at a colliding boundary produces a mountain range. A collision between 2 pieces of continental crust at a colliding boundary produces a mountain range.

9. Plate Boundaries Spreading Boundaries- mid ocean ridges (sea floor spreading) Spreading Boundaries- mid ocean ridges (sea floor spreading) It also occurs on land: rift valley It also occurs on land: rift valley Turn to page 160 in textbook Turn to page 160 in textbook A place where two plates slip past each other, moving in opposite directions, is known as a sliding boundary. A place where two plates slip past each other, moving in opposite directions, is known as a sliding boundary. A place where two plates come together is known as a colliding boundary A place where two plates come together is known as a colliding boundary

10. Plate Motions over time Many scientists believe that the plants have been moving before Pangaea. Many scientists believe that the plants have been moving before Pangaea. Pangaea, they believe, drifted together. Pangaea, they believe, drifted together. Then it began to break apart Then it began to break apart Look at page 162 in textbook Look at page 162 in textbook

11. Checking for Understanding What are plates? What are plates? A place where two plates slip past each other, moving in opposite directions, is known as a A place where two plates slip past each other, moving in opposite directions, is known as a A place where two plates come together is known as a A place where two plates come together is known as a

12. Guided Practice Independent Practice Guided Practice: Front side of worksheet Guided Practice: Front side of worksheet Stop!!! See Me!!! Stop!!! See Me!!! Independent Practice: Work on science study guide Independent Practice: Work on science study guide