Plate Tectonics
Chapter 11
Continental Drift
Section 11.1
Evidence of Continental Drift
What is Continental Drift?
Evidence of Continental Drift
Continental drift Alfred Wegener
continents have moved horizontally to their current locations
All continents were once connected as one large landmass that broke apart about 200 million years ago
Evidence of Continental drift
What are the evidences of Continental Drift?
Evidence of Continental Drift
Puzzle fit of continents
Fossil clues
Climate clues
Rock clues
How could continents drift?
Wegeners folly continental drift not accepted
Seafloor spreading
Seafloor Spreading
Section 11.2
Clues on the Ocean Floor
What is seafloor spreading?
Clues on the Ocean Floor
Seafloor spreading Harry Hess
Magma flows out of the seafloor pushing seafloor
Age evidence Glomar Challenger
Young crust in middle of ocean
Magnetic Clues magnetic reversals
Theory of Plate Tectonics
Section 11.3
Plate Tectonics
Describe the theory of Plate Tectonics.
Plate Tectonics
Crustal plates float on mantle
Lithosphere Plates crust and upper mantle
Asthenosphere plastic like layer below Lithosphere
Plate Boundaries
Divergent two plate are separating
Mid-ocean ridge
Rift
Great Rift Valley
Plate Boundaries
Convergent boundaries plates come together
Ocean/continental
Ocean/ocean
Continental/continental
Plate Boundaries
Ocean/continental
Subduction
Ocean Trench
Land Volcanoes
Plate Boundaries
Ocean/ocean
Suduction zone
Ocean trench
Volcanoes island arc
Plate Boundaries
Continental/continental
Mountain range
Earthquake
Plate Boundaries
Transform fault
Plates slide pass one another
Earthquakes
Causes of Plate Tectonics
What causes Plate Tectonics?
Causes of Plate Tectonics
Convection Currents drive the plates
Effects of Plate Tectonics
What are some effects of Plate Tectonics?
Effects of Plate Tectonics
Faults and Rift Valleys
Mountains, Arcs, and Volcanoes
Strike-Slip Faults
Before Pangaea, Rodinia
Section 11.4
Antarctic Collisions
Fossil Clues
Magnetic, Mountain and Margin Clues
Appalachian Mountains
Rodinia broke up
North America on the Move
Pangaea formed
