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2. Theory of Plate TectonicsTheory of Plate Tectonics
Plate TectonicsPlate Tectonics
Plate BoundariesPlate Boundaries
Causes of Plate TectonicsCauses of Plate Tectonics

3. Plate TectonicsPlate Tectonics

4. What is Plate TectonicsWhat is Plate Tectonics
• The Earth’s crust and upper
mantle are broken into
sections called plates
• Plates move around on top of
the mantle like rafts

6. What is theWhat is the LithosphereLithosphere??
• The crust and part of the upper
mantle = lithosphere
–100 km thick
–Less dense than the material
below it so it “floats”

7. What is theWhat is the
AsthenosphereAsthenosphere??
• The plastic layer below the
lithosphere = asthenosphere
• The plates of the lithosphere
float on the asthenosphere

9. 2 Types of Plates2 Types of Plates
• Ocean plates - plates below
the oceans
• Continental plates - plates
below the continents

10. Questions...Questions...
• What is the theory of plate
tectonics?
• What is the lithosphere?
• What is the asthenosphere?
• What is the connection between
the two?
• What are the two types of plates?

11. Plate BoundariesPlate Boundaries

12. Convergent BoundariesConvergent Boundaries
• Boundaries between two
plates that are colliding
 
• There are 3 types…

13. Type 1Type 1
• Ocean plate colliding with a
less dense continental plate
• Subduction Zone: where the
less dense plate slides under
the more dense plate
• VOLCANOES occur at
subduction zones

14. PLATE
A
PLATE
B

15. GUIDE QUESTIONS:
1.What type of plate is
Plate A? What about Plate
B? Why do you say so?

16. GUIDE QUESTIONS:
2.Describe what happens
to Plate A as it collides
with Plate B? Why?

17. GUIDE QUESTIONS:
3. What do you think may
happen to the leading
edge of plate A as it
continues to move
downward? Why?

18. GUIDE QUESTIONS:
4. What do you call this
molten material?
5. What is formed on top
of Plate B?

19. GUIDE QUESTIONS:
6. As the plates continue
to grind against each
other, what other geologic
event could take place?

20. CONTINENTAL
&
OCEANIC PLATES

21. Type 2Type 2
• Ocean plate colliding with
another ocean plate
• The less dense plate slides
over the more dense plate
creating a subduction zone
called a TRENCH

22. ACTIVITY 2.B CONVERGENCE OF
TWO OCEANIC PLATES

23. Aleutian Islands, AlaskaAleutian Islands, Alaska

24. GUIDE QUESTIONS:ACTIVITY 2.B
1. What are the geologic
processes/events that will
occur out of this plate
movement?

25. GUIDE QUESTIONS:ACTIVITY 2.B
2. What geologic features
might form at the surface
of Plate A?

26. GUIDE QUESTIONS:ACTIVITY 2.B
3.If the edges of Plate A
suddenly flicks upward, a
large amount of water
may be displaced. What
could be formed at the
surface of the sea?

27. Video

28. Type 3Type 3
• A continental plate colliding
with another continental plate
• Have Collision Zones:
–a place where folded and thrust
faulted mountains form.

29. ACTIVITY 2.C : CONTINENTANL
PLATES CONVERGING

30. GUIDE QUESTIONS:ACTIVITY 2.C
1. What happened to the
strips of clay as they were
pushed from opposite
ends?

31. GUIDE QUESTIONS:ACTIVITY 2.C
2. If the strips of clay
represent the Earth’s
Lithosphere, what do you
think is formed in the
lithosphere?

32. GUIDE QUESTIONS:ACTIVITY 2.C
3. What other geologic
event could take place
with this type of plate
movement aside from
your answer in Q2?

33. GUIDE QUESTIONS:ACTIVITY 2.C
4.In terms of consequences
on the Earths
Lithosphere, how will you
differentiate this type of
convergent plate
boundary with the other
two?

34. Andes Mountains,Andes Mountains,
South AmericaSouth America

36. FORMATION OF HIMALAY

37. FORMATION OF FOLD MO

38. Divergent BoundariesDivergent Boundaries
• Boundary between two plates
that are moving apart or rifting
 
• RIFTING causes SEAFLOOR
SPREADING

39. Features of DivergentFeatures of Divergent
BoundariesBoundaries
• Mid-ocean ridges
• rift valleys
• fissure volcanoes

43. GUIDE QUESTIONS:ACTIVITY 3
1. What are common on
the pictures?

44. GUIDE QUESTIONS:ACTIVITY 3
2. What do you think is
happening to the Earth’s
crust in those pictures?

45. GUIDE QUESTIONS:ACTIVITY 3
3. If the event continues
for million of years, what
do you think will be the
effect on the crust?

46. GUIDE QUESTIONS:ACTIVITY 3
4. Complete the part of
the video below to
illustrate your answer in
Q3.
VIDEO

47. Transform Fault BoundariesTransform Fault Boundaries
• Boundary between two plates
that are sliding past each other
• EARTHQUAKES along faults

49. San Andreas Fault, CASan Andreas Fault, CA

50. Questions...Questions...
• What are the three types of
boundaries?
• What direction do plates go for
each?
• Which boundary has a subduction
zone…what occurs at a
subduction zone?

51. Causes of PlateCauses of Plate
TectonicsTectonics

52. Convection CurrentsConvection Currents
• Hot magma in the Earth
moves toward the surface,
cools, then sinks again.
• Creates convection currents
beneath the plates that cause
the plates to move.

54. EARTH’S INTERIOR & PEARTH’S INTERIOR & P

55. Questions...Questions...
• What causes plates to move?
• How is a convection current
formed?