2. Review They are found at the surface of the Earth
Where are the continental and oceanic plates found? _____________________________________________
What is the difference between continental crust and oceanic crust?
What is a tectonic plate made of?
The upper and lower mantle
The lithosphere and asthenosphere
The crust and the lithosphere
the crust and the asthenosphere
They are found at the surface of the Earth
The continental crust is land while the oceanic crust is the ocean floor.

3. Diverging/Divergent Boundaries

4. convergent divergent transform
A boundary is where two plates meet together. There are three main types:
convergent
divergent
transform

5. away continental oceanic
A diverging boundary occurs where two tectonic plates move ________ from each other or are spreading apart. What happens depends on whether the plates involved are _____________ or _____________.
continental
oceanic

6. Two Oceanic Plates (under water)

7. Two Oceanic Plates (under water)

8. Two Oceanic Plates (under water)

9. Two Oceanic Plates (under water)
The magma shoots to the surface
The magma __________ down and _____________
_________________: the magma is pushed aside by new magma coming from below
The entire process is called seafloor spreading
cools
solidifies
ridge push

10. Two Oceanic Plates (under water)

11. Two Oceanic Plates (under water)

12. Two Continental Plates (on land)

13. rift valley Two Continental Plates (on land)
There is a weakened spot on the plate
Land sinks down and creates a _________
rift valley

14. Divergence of African and Arabia plates formed the Red Sea

15. For both cases, large amounts of magma can be released (called a ___________________) through the crack. This may result in the creation of a _____________.
rift eruption
volcano

16. Plates move so slow, we don’t see them move
Plates move so slow, we don’t see them move. How do we know that seafloor spreading occurs?

17. Mapping the Seafloor

18. Mapping the Seafloor

19. mountain ranges Atlantic Ocean Mid-Atlantic Ridge Mid-Ocean Ridge
Mapping the Seafloor
Explorers began to map the seafloor
discovered underwater ____________________
discovered a huge ridge from North to South in the middle of the ___________________ ( km)
the ridge is called the _____________________ or the _____________________
mountain ranges
Atlantic Ocean
Mid-Atlantic Ridge
Mid-Ocean Ridge

20. Age of Ocean Rock and Sediments
Young rock
Young rock
Old rock
Old rock

21. Age of Ocean Rock and Sediments

22. Paleomagnetism
paleomagnetism

23. spinning reverse magnetic reversal Paleomagnetism
Earth has a magnetic field due to its ____________ core.
every – years the _______________ in a process called _____________________
magma contains _______, which is attracted to magnetic fields
when magma cools, the iron gets “___________” in a certain direction
using a magnetometer, scientists found that rocks on either side of the Mid- Atlantic Ridge had a stripe pattern of alternating polarities
the _____________________ pattern shows that new rock was being made over time
reverse
magnetic reversal

24. Paleomagnetism

25. spinning reverse magnetic reversal iron trapped magnetic striping
Paleomagnetism
spinning
Earth has a magnetic field due to its ____________ core.
every – years the _______________ in a process called _____________________
magma contains _______, which is attracted to magnetic fields
when magma cools, the iron gets “___________” in a certain direction
using a magnetometer, scientists found that rocks on either side of the Mid- Atlantic Ridge had a stripe pattern of alternating polarities
the _____________________ pattern shows that new rock was being made over time
reverse
magnetic reversal
iron
trapped
magnetic striping

26. Paleomagnetism

27. Hot Spot

28. continental drift

29. Unifying Theory of Geology