TLW identify convergent, divergent, and transform plate boundaries For the purpose of understanding the different landforms formed by these plate boundaries As measured by naming the three types of plate boundaries correctly
Why do we have earthquakes? Plate Tectonics Why do we have earthquakes?
Is the earth’s crust solid? No, the earth’s crust is broken into many plates.
Do the plates move? At one time, there was only one continent called Pangaea. Yes, the plates move slowly over time.
Why do they move? Heat from the inner earth creates convection currents that move the magma.
Driving Forces of Plate Tectonics
Two Tectonic Plates That Separate Divergent Boundary Two Tectonic Plates That Separate
Magma rises up and new crust is formed Divergent Boundary Sea-floor spreading Magma rises up and new crust is formed
Divergent Boundary Mid-Atlantic Ridge Indian Ridge
Divergent Divergent Boundary Boundary
Divergent Boundary Rift Valley Iceland
Divergent Boundary Rift Valley in Africa
(Land Subsidence = sinking land) The East African Rift Valley is land that has sunken by divergent boundary (Land Subsidence = sinking land)
Two tectonic plates slide past each other. Transform Boundary Two tectonic plates slide past each other.
Transform Boundary
Transform Boundary
Two tectonic plates collide. Convergent Boundaries Two tectonic plates collide.
Ocean-Continent Convergent Boundary Rising magma forms new crust in the form of mountains and volcanoes Two plates converge Heavier plate squeezed down Sea Trench Subduction Melting of old crust
Andes Mountains Visualizing Physical Geography Copyright © 2008 John Wiley and Sons Publishers Inc.
Ocean-Ocean Convergent Boundary Aleutian Trench Old crust is melted and recycled.
Aleutian Islands
Continent-Continent Convergent Boundary No new crust is formed or created
TLW identify convergent, divergent, and transform plate boundaries For the purpose of understanding the different landforms formed by these plate boundaries As measured by naming the three types of plate boundaries correctly