Plate Tectonics
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PRESENTATION OUTLINE
PLATE BOUNDARIES
BY: BRIANNA WILDROUDT
PLATE TECTONICS
PIECES OF EARTH'S LITHOSPHERE MOVE BY CONVECTION CURRENTS
CONVECTION CURRENTS
THE MOVEMENT OF FLUID CAUSED BY DIFFERENCES IN TEMPERATURE
SLAB PULL
GRAVITY ACTING ON OCEAN CRUST AND PULLS CRUST INTI THE MANTLE
RIDGE PUSH
MAGMA PUSHING ON THE PLATES AND PUSHES THEM APART
DIVERGENT
PLATE BOUNDARY WHERE TWO PLATES MOVE AWAY FROM EACH OTHER
On land divergent plate boundaries form rift valleys.
In the ocean, divergent plate boundaries form mid-ocean ridges.
CONVERGENT PLATE BOUNDARIES
TWO PLATES MOVE TOWARD EACH OTHER
When ocean and continental crust converge they form volcanic arcs, like Mount St. Helens.
When ocean and ocean crust converge they form island arcs, like the Aleutians Islands and the Japan Islands.
When continental crust converges with continental crust it forms mountains, like the Himalayan Mountains.
SUBDUCTION ZONE
OCEAN CRUST SINKS INTO OCEAN TRENCH AND INTO THE MANTLE
