1. Plate tectonics
Year 1 science

2. review
________ ___________Theory of ______________Drift was rejected because he couldn’t prove ________ the continents were moving apart.
It wasn’t until after Wegener died that ________ Hess soon claimed the reason behind Continental Drift… _______________________

3. review
Alfred Wegener’s Theory of Continental Drift was rejected because he couldn’t prove WHY the continents were moving apart.
It wasn’t until after Wegener died that Harry Hess soon claimed the reason behind Continental Drift… SEA FLOOR SPREADING

7. New Theory
Scientists used this information to come up with a new theory: The Theory of Plate Tectonics
The lithosphere is made of huge plates that are in constant, slow motion, driven by convection currents in the mantle.

9. Effects
As the plates move and collide, plate boundaries are formed. There are 3 different types:
Convergent
Divergent
Transform

10. Divergent boundaries
Boundaries where plates pull apart

12. Convergent boundaries
Boundaries where plates come together

15. Transform boundaries
A boundary in which 2 plates scrape past each other in opposite directions

18. How it works!
Plate Tectonics