1. Draw Earth’s layers (crust, mantle, cores)
COMPARE & CONTRAST THE EARTH’S LITHOSPHERE with AESTHENOSPHERE
1. EXPLAIN HOW CONVECTION WORKS
Where does TEMPERATURE in the EARTH come from?
What does DENSITY have to do with EARTH’s inner LAYERS and what are they MADE of?
LIST & DESCRIBE
FIVE (5) PIECES of EVIDENCE
that SUPPORT the theory of
CONTINENTAL DRIFT.
EXPLAIN WEGENER’s EVIDENCE for
HIS theory of CONTINENTAL DRIFT!
Explain his theory!!!
Draw Earth’s layers (crust, mantle, cores)
Draw the most recent one here
DRAW
WEGENER

2. IN 1912…
WEGENER made a lot of INFERENCES about what was happening to our Earth surface.

3. WEGENER made a lot of INFERENCES about what was happening to our Earth surface.

4. WITH PIECES called PLATES.
WEGENER made a lot of INFERENCES about what was happening to our Earth surface.
PRESSURE
ALL THAT…
KEEPS EARTH CRACKED
WITH PIECES called PLATES.

5. Who came up with the theory of Continental Drift?

6. We all remember WEGENER!

7. Wegener’s EVIDENCE for his Theory of Continental Drift:

8. Puzzling evidense…

9. Wegener evidence of CONTINENTAL DRIFT!
1. Fossils of the same species were discovered on TWO different CONTINENTS.

10. Wegener evidence of CONTINENTAL DRIFT!
1. Fossils of the SAME SPECIES were discovered on TWO different CONTINENTS.

11. 1. . Fossils of the same species were discovered on TWO different continents.

12. 1. Similar fossils of the same species were discovered on 2 DIFFERENT continents..

13. Paleontologists (dinoscientists) have connecting fossil records to show how the continents were once connected as _ _ _ _ _ _.

14. AROUND 250,000,000 YEARS AGO HOW LONG AGO?
Paleontologists (dinoscientists) have been tracking the fossil records to show how the continents were once connected as PANGAEA.
AROUND 250,000,000 YEARS AGO
HOW LONG AGO?

15. Paleontologists (dinoscientists) have been tracking the fossil records to show how the continents were once connected as PANGAEA.

16. 2. ROCK LAYERS in the exact same layered positions on two different continents.
2. Wegener found rock layers in the exact same layered positions on two different continents.
Appalachian rocks…
Scottish highlands!

17. 2. ROCK LAYERS in the exact same layered positions on two different continents.
Brazil….
West Africa!

18. 3. Wegener found odd places for fossils…like tropical ferns in icy Greenland,

19. 3. Wegener found odd places for fossils…like snail fossils on top of icy mountains,

20. 3. Wegener found odd places for fossils…like snail fossils on top of icy mountains,

21. 3. Wegener found odd places for fossils… glaciers scratched rocks in South Africa.

22. 3. Wegener found odd places for fossils… glaciers scratched rocks in South Africa… global climate change.

23. But alas, poor Wegener

24. But alas, poor Wegener
Wegener couldn’t show ___ the plates move.

25. But alas, poor Wegener
Wegener couldn’t show HOW the plates move.

26. But alas, poor Wegener Wegener couldn’t show HOW the plates move.
Back then, we had no GPS (global position satellites) nor did we know much about atomic radiation nor C _ _ V_ C _ _ _ N

27. But alas, poor Wegener Wegener couldn’t show HOW the plates move.
Back then, we had no GPS (global position satellites) nor did we know much about atomic radiation nor CONVECTION!

28. CONVECTION occurs in the ASTHENOSPHERE
CONVECTION occurs in the ASTHENOSPHERE. As hot, less dense rock floats to the top…cools… then sinks back down again…& again & again.
LITHOSPHERE
ASTHENOSPHERE
REST OF THE HOT STUFF!

30. So, we have a LOT MORE evidence to support Wegener’s Theory of Continental Drift today!
magnetic volcanic rock, seismology exercise, and finally magnetic reversals, (compasses)

31. NEW Continental Drift EVIDENCE:
1. MAGNETIC REVERSAL in our mid- ocean ridges
NEW
get compasses iron core…nail battery?

32. PLATES that MOVE AWAY form NEW CRUST usually IN THE MID OCEAN RIDGES.
These submarines also showed us evidence of MAGNETIC REVERSALS!

33. The changing in direction of the Earth’s magnetic poles.
Magnetic Reversal
The changing in direction of the Earth’s magnetic poles.
When the Earth’s poles do change direction, the rocks on the seafloor become magnetically charged in the opposite direction.

34. Compare Earth to a Magnet

35. Compare Earth to a Magnet

36. Compare Earth to a Magnet

38. NEW Continental Drift EVIDENCE:
1. MAGNETIC REVERSAL in our mid- ocean ridges. 2.
NEW

39. NEW Continental Drift EVIDENCE:
1. MAGNETIC REVERSAL in our mid- ocean ridges. 2. Careful MAPPING & TRACKING the movement of Earth’s PLATES.
NEW

40. Geologists have mapped all of the Earth’s plates.

41. Scientists track the movement of our Earth’s plates…
over land

42. Scientists track the movement of our Earth’s plates…
under sea

43. Subs use SONAR…
Sonar --(sound echo-location) to map the ocean floor.

44. NEW Continental Drift EVIDENCE:
1. MAGNETIC REVERSAL in our mid- ocean ridges. 2. Careful MAPPING & TRACKING the movement of Earth’s PLATES. SONAR…undersea
NEW

45. Geologists study ROCK core samples to show how and when our rocky lands were once connected.

46. NEW Continental Drift EVIDENCE:
1. MAGNETIC REVERSAL in our mid- ocean ridges. 2. Careful MAPPING & TRACKING the movement of Earth’s PLATES. SONAR…undersea ROCK CORE samples
NEW