文档介绍：Plate Tectonics
Geological theory that states that pieces of the Earth’s Lithosphere are in constant, slow motion, driven by convection currents in the mantle.
The Theory of Plate tectonics explains the formation, movement, and subduction of Earth’s plates.
J. Tuzo Wilson
1965 proposed that the lithosphere was broken into pieces creating sections called plates
Stated that the plates closely fit together along cracks in the lithosphere
Plate Tectonics video
Characteristics of Plate Tectonic
As plates move they collide, pull apart, and grind past each other
Convection currents in the asthenosphere provide the energy for movement.
Plated move away from each other at rifts or ridges and toward each other at convergent zones.
Plate boundaries three types
Convergent – ing together
Divergent – plates moving apart
Transform- plates sliding past each other
Transform Boundaries
Two plates sliding past each other
Frequent Earthquakes
San Andreas Fault California
Divergent Boundaries
Plates moving away from each other
Mid Ocean Ridge (MOR)
Great Rift Valley in Africa
Convergent Boundary
Two ing together
One usually pushes out on top
Produces Mountain ranges and trenches depending on the plate type.
Rates of Movement
North Americ