1. Bellwork Box #7 Read page 248:
What did Alfred Wegener’s continental drift hypothesis state?
Read pages
What are the 3 types of evidences supporting the hypothesis?

2. In 1912,Alfred Wegener proposed an idea:
Continental Drift
In 1912,Alfred Wegener proposed an idea:
All of the continents drift and were once joined together in 1 single supercontinent

3. Plate Tectonics

4. Wegener’s hypothesis needed evidence before it became an accepted theory…

5. Evidence of Continental Drift
Fossil
Climatic
Geological (Rock Types)
Paleomagnetic
Seafloor Spreading

6. These reptiles could not have swum across the Atlantic Ocean.
1.Fossil
270 myo identical fossil remains of the reptile, Mesosaurus, have been found in both eastern South America and western Africa.
These reptiles could not have swum across the Atlantic Ocean.

7. 1.Fossil

8. 2. Climatic
Ancient glacial grooves on current continents in the Southern hemisphere

9. Gondwana Reconstruction of Southern hemisphere super continent
Gondwana Reconstruction of Southern hemisphere super continent. Notice how ring of glaciers match the patterns of a polar ice

10. Geological

11. Ex: Appalachian Mountains to New Foundland
3. Geological:
Mountain belts at the end of one coastline have reappeared on landmasses across the ocean.
Ex: Appalachian Mountains to New Foundland

12. 4. Seafloor Spreading
At locations on the seafloor, where new crust is created, rocks get progressively younger as a ridge is approached. Ex:Mid Ocean Ridge -MOR

13. Paleomagnetic

14. 5. Paleomagnetic
As the seafloor spreads, creating new continental crust, all magnetic minerals align with the magnetic north and south poles. This alignment creates alternating stripes of magnetic and non-magnetic rocks on the ocean floor.

17. Wegener was right! All of the continents were once joined together in a supercontinent named Pangaea After 50 years of research with new technology, scientists came up with the…

20. The theory helps explain the formation and movements of the plates
Theory of Plate Tectonics (1960) Earth’s surface consists of rigid, but moving pieces called tectonic plates
The theory helps explain the formation and movements of the plates

22. Tectonic Puzzle Assignment
Use your notes and knowledge about evidence to reconstruct a supercontinent!
Cut out the shapes on the green sheet of paper and form Pangaea
Glue the completed puzzle to the purple sheet of paper

23. 3) Rock Types and Structures
Homework (pg )
3 Limited Word Organizers for
the types of evidence to support the continental drift hypothesis:
1) Fossil
2) Climate
3) Rock Types and Structures