Plate Tetonics
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PRESENTATION OUTLINE
PLATE TECTONICS
THE LITHOSPHERE IS BROKEN INTO PIECES THAT SHIFT
SLAB PULL
THE PROCESS OF A TETONIC PLATE DESCENDING INTO THE MANTLE.
RIDGE PUSH
A FORCE CREATED BY TETONIC PLATES MOVING AWAY A DIVERGENT BOUNDARY
DIVERGENT PLATE BOUNDARY
CONSTRUCTIVE BOUNDARY WHERE TWO PLATES MOVE AWAY FROM EACHOTHER
ON LAND DIVERGENT BOUNDARIES FORM
- Rift valleys
IN THE OCEAN DIVERGENT BOUNDARIES FORM
- Underwater mountains/mid ocean ridge
- Underwater volcanoes
CONVERGENT PLATE BOUNDARY
DESTRUCTIVE BOUNDARY WHERE PLATES MOVE TOWARDS EACHOTHER.
WHEN OCEANIC AND CONTINENTAL CRUST CRASH THEY FORM
- Volcanic arch
- Examples:
- Mt. St. Helens
- Andes mountains
WHEN OCEAN AND OCEAN CRUST CONVERGE THEY FORM
- Island arches
- Examples:
- Islands of Japan
- Aleutian Island
WHEN CONTINENTAL CRUSTS CONVERGE THEY FORM
MOUNTAINS (EX. MT. EVEREST)
SUBDUCTION ZONE
THE AREA WHERE OCEANIC CRUST SINKS BACK INTO THE MANTLE.
DEEP OCEAN TRENCH
- A DEEP VALLEY ALONG THE OCEAN FLOOR WHERE OCEANIC CRUST SINKS.
- An example is the Mariana Trench.
TRANSFORM PLATE BOUNDARY
A PLATE BOUNDARY WHERE TWO PLATES SLIDE PAST EACH OTHER.
WHEN PLATES MOVE ALONG TRANSFORM BOUNDARIES IT CAUSES EARTHQUAKES.
AN EXAMPLE OF A TRANSFORM BOUNDARY IS
- San Andreas fault in California.
