1. Plate Tectonics
Chapter 4.5

2. Who is J. Tuzo Wilson and what was his idea?
J.Tuzo Wilson proposed that all the lithosphere is broken into separate sections called plates. His idea lead to the current theory of Plate tectonics.

3. What is the theory of Plate Tectonics?
The Theory of Plate Tectonics states that pieces of Earth’s lithosphere are in constant, slow motion, driven by convection currents in the mantle. The theory explains the formation, movement, and subduction of Earth’s Plates.
Map with boundaries
Plate tectonic video

6. Describe and draw the three types of plate boundaries.
Three Kinds of Plate Boundaries:
1) Transform Boundaries
Two plates slip past each other, moving in opposite directions. Earthquakes often happen at this kind of boundary.
Transform boundary animation
Plate tectonic video

8. 2) Divergent Boundaries
Two plates move apart. Most happen at the mid-ocean ridge. Rift valleys are a kind of divergent boundary that forms on land.
Divergent plate boundary animation.
Rift valley animation
Plate tectonic video

9. Rift Valley

10. Convergent Boundaries
Two plates come together. When two plates converge, or come together, a collision happens.
Convergent Plate Boundary

11. Three types of convergent boundaries A.) Oceanic crust – Ocean crust
What are the three types of convergent boundaries. What happens at each type.
Three types of convergent boundaries
A.) Oceanic crust – Ocean crust
The plate more dense dives under the other plate. SUBDUCTION
B) Oceanic Crust – Continental Crust
The less dense continental crust can’t sink under the denser O.C., so the O.C. plunges beneath the C.C. SUBDUCTION
C) Continental Crust – Continental Crust
Subduction doesn’t happen. Instead the plates crash head-on and form mountain Ranges. MOUNTAINS
c.c. colliding with c.c.video

12. Animation of all three plate boundaries.
Animation of all three types.
Plate tectonic video
Bill Nye Plate tectonics Video Bill Nye.asf

13. ______________________________

14. What causes the plates to move?
Pacific Ocean is getting smaller and the Atlantic Ocean is getting wider due to seafloor spreading and subduction.