Plate Tectonics
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PRESENTATION OUTLINE
PLATE TECTONICS
- The theory that Earths lithosphere is in constant motion, driven by currents in the mantle.
Photo by N@ncyN@nce
CONVECTION CURRENTS
- The movement of fluid, that transfers heat from one part of the fluid to the other.
Photo by Tweek
SLAB PULL
- The process of a tectonic plate descending into the mantle.
RIDGE PUSH
- A force created by tectonic plates moving away from a divergent boundary.
DIVERGENT PLATE BOUNDARY
- A plate boundary where two plates move away from each other.
- An example of a divergent boundary is the East African Great Rift Valley.
On land, divergent plate boundaries form a Rift Valley.
In the ocean, divergent plate boundaries form mid ocean ridges.
CONVERGENT PLATE BOUNDARIES
- A plate boundary where two plates move toward each other.
- One example of a convergent boundary is the Andes Mountain range.
Photo by Stuck in Customs
When ocean and continental crust converge, they form volcanic arcs like the Andes.
Photo by martin (necktru)
When ocean and ocean crust converge they form island arcs like the islands of Japan.
Photo by NASA's Marshall Space Flight Center
When continental crust converges with continental crust it forms mountain ranges like the Himalayas.
Photo by A.Ostrovsky
SUBDUCTION ZONE
- When oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary.
DEAP OCEAN TRENCH
- A deep valley along the ocean floor, beneath which oceanic crust slowly sinks towards the mantle.
- An example is the Mariana Trench, in the pacific.
Photo by NASA's Marshall Space Flight Center
Transform boundary
- A plate boundary where two plates slide past each other in opposite directions.
- One example of the transform boundary is the SanAndreas fault.
Photo by Travis S.
When plates move along transform boundaries, it causes earthquakes.
Photo by martinluff
