Plate boundaries 8-3.6 Chapter 6, lesson 3 Page 198-205

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

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

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

Changes of Landforms over Geologic Time Plates move @ 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

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