1. HOW???

2. Plate Tectonics KEY VOCABULARY TERMS
Crust Mantle Outer Core Inner Core Lithosphere Asthenosphere Convection Current Magma/Lava Law of Uniformitarianism Tectonic Plates Subduction
Divergent Boundary
Convergent Boundary
Transform Boundary
Mid-Ocean Ridge
Rift Valley
Deep-ocean Trench
Pangaea
Continental Drift
Sea floor Spreading
Magnetic Reversal
Hot Spot

3. Today’s Learning Target:
Learn how convection currents shape our earth.

4. QUICK REVIEW… Layers of the Earth
Crust (2 types)
Mantle
Outer Core
Inner Core
Earth’s crust & the very top solid portion of the mantle form the lithosphere
The lithosphere sits on top of the liquid asthenosphere

5. Drawings…
Lithosphere
Two types of Crust

6. LAW OF UNIFORMITARIANISM
Law of Uniformitarianism: States that Earth is an always changing place
The same forces of change are at work today that were at work in the past.
Some changes are gradual; some changes are fast…some times both!

7. TECTONIC PLATES
The Lithosphere is broken into many large and small slabs of rock called tectonic plates and where two plates meet, a lot of changes can occur.

8. Some things happen slowly, while others happen quickly
Some things happen slowly, while others happen quickly. But what they both have in common is a lot of them stem from MOVEMENT …but…MOVEMENT OF WHAT????
HINT:

9. How do the tectonic plates move?
The plates move because of convection currents.
The hot, soft rock in the mantle rises…then it cools, and sinks.
How do the tectonic plates move?

10. There are 3 types of plate boundaries
TECTONIC PLATES
1. Divergent
2. Convergent
3. Transform
There are 3 types of plate boundaries

11. DIVERGENT
Key word: Divide

12. DIVERGENT

13. DIVERGENT Mid-ocean Ridges Rift Valleys Earthquakes Volcanoes
What occurs at this boundary?
New Crust Forms
Mid-ocean Ridges
Rift Valleys
Earthquakes
Volcanoes

14. REAL-WORLD EXAMPLES : Divergent Boundary
Mid-Ocean Ridges like the Mid-Atlantic Ridge

15. Iceland

16. African Rift Valley

17. Drawings…Divergent

18. CONVERGENT Key word: Collide 3 types of convergent:
Continental-continental
Oceanic-oceanic
Oceanic-continental

19. CONVERGENT: CONTINENTAL-CONTINENTAL

20. CONVERGENT: CONTINENTAL-CONTINENTAL
What occurs at
this boundary?
High mountains
Earthquakes

21. REAL-WORLD EXAMPLES: Continental-Continental Convergent
High Mountains like the Himalayas

22. Drawings…Cont-Cont Convergent

23. Plate Tectonics Part 2

24. CONVERGENT: OCEANIC-OCEANIC

25. SUBDUCTION What is SUBduction?
When one tectonic plate sinks under another plate
IT CAN ONLY HAPPEN WHEN…
Continental & oceanic plate collide = the oceanic plate ALWAYS sinks because it is more DENSE.
Oceanic & oceanic plate collide = the denser plate sinks!

26. CONVERGENT: OCEANIC-OCEANIC
What occurs at this boundary?
Deep-ocean Trenches
Volcanic Islands
Earthquakes
Hawaii is NOT on a plate boundary!

27. REAL-WORLD EXAMPLES: Oceanic-Oceanic Convergent
Deep-ocean trenches like the Mariana Trench

28. Oceanic-Oceanic Convergent Example Volcanic Island Chains

29. Drawings…Oceanic-Oceanic Convergent

30. CONVERGENT: OCEANIC- CONTINENTAL

31. CONVERGENT: OCEANIC-CONTINENTAL
What occurs at this boundary?
Deep-ocean trenches
Coastal mountains (some are volcanic)
Earthquakes

32. REAL-WORLD EXAMPLES: Continental-Oceanic Convergent
Coastal mountains like the Andes Mountains on the coast of South America

34. Oceanic-Continental Convergent

35. Drawings…Oceanic-Continental Convergent

36. TRANSFORM
Key word: Slide

37. TRANSFORM

38. TRANSFORM
What occurs at this boundary?
Faults
Earthquakes

39. REAL-WORLD EXAMPLES: Transform Boundary
Faults, like the San Andreas Fault in California

40. Drawings…Transform Boundary

41. LANDFORMS VS. EVENTS Mid Ocean Ridge Rift Valleys New crust forms
Volcano
Earthquakes
Volcanic eruption
New crust forms
Divergent:
Cont-Cont
Convergent:
High Mountains
Earthquakes
Coastal Mountains
Deep Ocean Trench
Volcano
Ocean-Cont
Convergent:
Earthquakes
Volcanic eruption
Transform:
Fault line
Earthquakes