1. Plate Tectonics 10/22/12
*Take out your Continental Drift summary for me to check*
Earth’s Insides
Plate boundaries
Do Now [journal]
How do plate tectonics cause changes in crustal features?
What is the lithosphere?
What are the three pieces of evidence for continental drift?

2. The Earth’s Insides
Early earth

3. There are five major layers within the earth that are identified on the basis of their different compositions.

4. NAME
SOLID/LIQUID/GAS?
DENSITY
Lithosphere
Solid! 1
Asthenosphere
Semi-liquid 2
Mantle 3
Outer core
Liquid 4
Inner core
Solid 5

5. How does density relate to our Earth’s insides?
Density differences cause matter to sink or float. Let’s see this in action!

6. Density of layers
Silicon and oxygen rise to form lithosphere (lightest continental crust, lighter oceanic crust). What layer was this? Silicon and iron sink to the middle to form the mantle. What layer was this? Iron and nickel sink to form core. What layers were these?

7. How do we know the Earth has a solid core?
Bill Nye explains it again!

8. As plates move, they collide, pull apart, and grind past each other causing major geological events!!

9. Topic: Earth’s Features
Essential Question: What crustal features are created by the movement of Earth’s plates?

10. Topic: Earth’s Features Essential Question: What crustal features are created by the movement of Earth’s plates?
Plate tectonics The lithosphere (crust) is divided into tectonic plates The movement of these plates is what creates Earth’s crustal features

12. Topic: Earth’s Features Essential Question: What crustal features are created by the movement of Earth’s plates?
Types of boundaries A boundary is where 2 tectonic plates meet

13. The theory of plate tectonics states that pieces of Earth’s lithosphere are in constant, slow motion, driven by convection currents in the mantle. We will look at our demonstration and look for this convection on a small scale.

14. Topic: Earth’s Features Essential Question: What crustal features are created by the movement of Earth’s plates?
Divergent Boundary When tectonic plates move away from each other Crustal features: mid ocean ridges, rifts

15. Great Rift Valley

16. Topic: Earth’s Features Essential Question: What crustal features are created by the movement of Earth’s plates?
Convergent Boundary When 2 continental plates collide Crustal features: mountains

17. The Himalayas

18. Topic: Earth’s Features Essential Question: What crustal features are created by the movement of Earth’s plates?
Convergent Boundary When an ocean plate collides with a continental plate, the ocean plate sinks under the continental plate (subduction) Crustal features: trenches and volcanic mountains

20. Topic: Earth’s Features Essential Question: What crustal features are created by the movement of Earth’s plates?
Transform Boundary When 2 tectonic plates slide past each other Crustal Features: faults and earthquakes

21. San Andreas Fault