1. Plate Movement and Plate Boundaries
Chapter 4, Section 3

2. Plate Tectonics Theory
Lithosphere is divided into plates
Plates move around on the asthenosphere

4. 3 Causes of plate motion

5. Slab Pull Oceanic plate sinks (more dense)
Pulls rest of tectonic plate with it

6. Oceanic crust is higher at ridge Pushes plate underneath continent

7. Convection Happens in asthenosphere Hot magma rises, cool magma sinks
Drags plates sideways

8. 3 Types of Plate Boundaries
Convergent
Divergent
Transform Fault

9. Convergent Boundaries

10. Continent / Continent
Plates thicken and buckle
Push upwards
Mountain formation

12. Continent / Oceanic Oceanic plate sinks (more dense) Subduction zone
Trenches form
Volcanic mtns on coast

14. Oceanic / Oceanic One slides under the other Subduction zones
Volcanic Islands

15. Divergent Boundary Plates spread apart Magma rises
New lithosphere formed
Mid – Atlantic Ridge

17. Plates slide past each other Produce earthquakes
Transform Boundary
Plates slide past each other
Produce earthquakes

18. Types of Plate Boundaries:
Divergent
Convergent
Transform

21. Continent / Continent Examples
Appalachian Mtns.
Atlas Mtns.

23. Continent / Oceanic Examples
Andes
Cascades
Mt. St. Helens

25. Oceanic / Oceanic Examples
Aleutians
Japan
Philippines

27. Rate a fingernail grows!
Plate Movement
Approx. 3-6 cm per year
Rate a fingernail grows!

28. Flash card review