1. Plate boundaries
8-3.6
Chapter 6, lesson 3
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2. Divergent boundary Where 2 plates are moving apart
Most are located along mid-ocean ridge (sea floor spreading)
New crust forms b/c magma pushes up & hardens between separating plates

3. Convergent boundary Where 2 plates come together & collide
Activity depends on the types of crust that meet
More dense oceanic plate slides under less dense continental plate or another oceanic plate -subduction zone , some crust is destroyed
2 continental plates converge, both plates buckle & push up into mountain ranges

4. Transform boundary Where 2 plates slide past each other
Crust is neither created nor destroyed
Earthquakes occur frequently along this type of boundary

6. Changes of Landforms over Geologic Time
Plates very slow rates- from about 1 to 10 cm per year
At 1 time- continents joined together in one large landmass called Pangaea
As plates continued to move & split apart, oceans were formed, landmasses collided 7 split apart until Earth’s landmasses came to be in the positions they are in now

7. Evidence
Evidence of these landmasses, collisions, & splits comes from fossils, landform shape, features, rock structures, & climate changes
Landmasses changes can occur at hot spots within the lithospheric plates
Hot spot- area of volcanic activity in the middle of a tectonic plate
Earth’s landmasses will continue to move & change during the geologic time of the future