1. Today: Isostacy….’Solids floating on a liquid’ Question of the day: How thick (in miles) is Earth’s crust?

3. Types of Plate Boundaries

4. Types of Plate Boundaries: Transform  Characteristics:  Many E.Q.’s (mostly shallow, can be mixed)  Volcanoes  Varying topography  Different age of the sea floor is located next to each other.  Can you find which example might be a transform boundary type?

5. Types of Plate Boundaries: Divergent  Characteristics:  Shallow E.Q.s  Few E.Q, but right on boundary  Few to no volcanoes, along boundary if present  Young rocks on both sides of boundary  Rise in sea floor elevation along boundary  Can you find which example might be a divergent boundary type?

6. Types of Plate Boundaries: Convergent  Characteristics:  Many E.Q.s  Abundant volcanoes  Deep ocean floor, mountains on land  Varying age of sea floor  Can you find which example might be a convergent boundary type?

7. Today: Isostacy….’Solids floating on a liquid’ Question of the day: How thick (in miles) is Earth’s crust?

8. Journey into the Earth

9. Isostacy  Solid floating on a Liquid  Step 1 – Create a data chart BlockMassVolumeDensitymm abovemm below 1 2 3 1 2 3

10. Isostacy  Solids floating on liquids  Step 2 – Find Density! What is the formula for Density? Mass divided by Volume

11. Next: Calculate the density  Mass divided by Volume

12. Isostacy  Mass divided by Volume… what does that mean? How do I find mass? How do I find volume?

13. Isostacy  Mass divided by Volume… what does that mean? How do I find the volume of this wooden block? Ans: Length x width x height

14. Isostacy  Floating and sinking  Together we will measure how much of the block floats in the water.   - Write down the values as we do this in front of class 

15. Data: Record your measurements BlockMassVolumeDensitymm abovemm below 1 2 3 1 2 3

16. Isostacy  Mass divided by Volume… what does that mean? Ans: Length x width x height Always measure in cm for volume and gr for mass

17. Isostacy  We will discuss the questions at the bottom during the last 5 minutes of class.

18. Isostacy  How does this relate to the Earth?

19. Isostacy  How does this relate to the Earth?  Look at the Density of Earth’s Layers. How does this tie in to what we just did?

20. Early Earth and Plate Tectonics

21. Three Main Types of Plate Boundaries  1. Divergent  Plates Move Away from each other  2. Convergent  Plate crash into each other  3. Transform Fault  Plates grind past each other

22. Layers of the Earth  This is something called “Snack Tectonics”  Let’s model what happens at Plate Boundaries

23. Divergent Boundary

24. Convergent Boundary

25. Transform Fault Boundary

26. Something to think about…  Why do the Plates move?