1. 2. Evidence of Plate Tectonics
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2. Evidence of Plate Tectonics
Sea- floor Spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity then gradually moves away from the ridge
This supports the theory of plate tectonics

2. Rift Process
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Mid-ocean ridge
Rift Valley

3. 1. Evidence of Sea Floor Spreading
Age Evidence- As the distance from the ocean ridge __________ the age of the rock ___________
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increases
increases

4. 1. Evidence of Sea Floor Spreading
Age Evidence- As the distance from the ocean ridge __________ the age of the rock ___________
Page 8
increases
increases

5. 2. Magnetic Evidence- clues from iron bearing basalt rocks supports the theory of seafloor spreading
Page 8 N N
Normal
Reverse
Key S S

6. Magnetic Evidence- magnetic minerals line up with the poles which have flipped over the years
Page 8 N N
Normal
Reverse
Key S S

7. Show DVD 100 Greatest Discoveries in Earth Science
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Show DVD 100 Greatest Discoveries in Earth Science

8. Page 8
3. Pillow Rocks (Lava Rocks)- strange rocks shaped like pillows because molten rock hardens quickly after erupting underwater

9. What is the driving force beneath plate tectonics __________________________________
Convection Currents
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10. Model of convective flow in the mantle
Complete lab 4-2
Pages
Page 9
Figure 12.14

11. less more carries/moves
Hot ______ dense material form deep within Earth’s mantle rises. When this material cools near the surface, it becomes _______ dense and sinks. The resulting convective flow of this material in the mantle ______________ lithospheric plates across the surface of Earth.
less
more
carries/moves
Divergent
convergent
cells
convection
subduction
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12. Questions
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Increases
Divergence C D

13. Page 10 C A D

14. Type of Plate Boundaries
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Plate Boundaries- the movement and interaction of tectonic plates creates 3 types of plate boundaries: the arrows on the tectonic map (ESRT page 5) show the relative motion.
Type of Plate Boundaries
Direction of Movement
Arrows on the Map
Away from each other
Divergent
Towards each other
Convergent
Laterally or sideways
Transform

16. Convergent Plate Boundaries- _______________________________________
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Where two plates are coming together/ colliding

17. TYPE: Oceanic-Continental Plates
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TYPE: Oceanic-Continental Plates
Oceanic plate subducts under the continental plate b/c ocean plate in more dense

18. _______________________________________
Keys Features-
_______________________________________
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Subduction, explosive volcanoes, mountains, ocean trenches , Earthquakes

19. _______________ - Examples: Convergent Boundary
(Oceanic- Continental)
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Northwest United States & West coast of South America