Plate Tectonics
Published on Nov 21, 2015
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PRESENTATION OUTLINE
PLATE TECTONICS
BY: ISABELLE PHILLIPS
PLATE TECTONICS
- Pieces of the earths lithosphere are in slow constant motion
- Driven by convection currents in the background
Photo by WorldIslandInfo.com
CONVECTION CURRENTS
COVECTION CURRENTS IN THE MANTLE CAUSE PLATES TO MOVE
GRAVITY
GRAVITY PULLING ON THE PLATES IN THE SUBDUCTION ZONE
SEA-FLOOR SPREADING
NEW CRUST FORMING PUSHES THE TECTONIC PLATES APART
DIVERGENT
BOUNDARY WHERE PLATES MOVE APART
RESULTING LANDFORM FROM DIVERGENT
FORM RIFT VALLEY WHEN THEY OCCUR ON LAND
RESULTING LANDFORM FROM DIVERGENT (SEA)
MID-OCEAN RIDGE IS AN EXAMPLE
CONVERGENT
A PLACE WHERE TWO PLATES CONVERGE
OCEAN VS. CONTINENT
- When ocean crust collides with continental crust
- Deep-ocean trench forms
- Trench with volcanic arc
OCEANIC VS. OCEANIC
- Trench with island arc or underwater volcanic arc forms
- Destuctive plate boundary, causes crust to be destroyed.
CONTINENT VS. CONTINENT
- Destructive plate boundary
- Crust is destroyed
- Mountain range forms
SUBDUCTION ZONE
BY WHICH OCEAN CRUST SINKS BENEATH A DEEP OCEAN TRENCH
DEEP OCEAN TRENCH
Deep ocean trench forms when ocean crust collides with continental crust
TRANSFORM
TWO PLATES SLIP PAST EACH OTHER, MOVING IN OPPOSITE DIRECTIONS
RESULTS
VOLCANOES AND EARTHQUAKES FORM
