Copy of Plate Tectonics
Published on Nov 18, 2015
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PRESENTATION OUTLINE
Plate tectonics
SECTIONS OF THE LITHOSPHERE FLOAT IN SLOW CONSTANT MOTION
CONVECTION CURRENTS
CURRENTS CAUSED BY DIFFERENT DENSITIES IN THE MANTLE
SLAB PULL
THE PULL OF GRAVITY ON A SUBDUCTING PLATE
RIDGE PUSH
NEW CRUST FORMS AT MID OCEAN RIDGES AND PUSHES WAY OLD ROCK
DIVERGENT PLATE BOUNDRY
OCCURS WHEN TWO PLATES PULL AWAY FROM EACHOTHER OR DIVERGE
RIFT VALLEYS
- A divergent boundry on land creats a landform called rift valley
- A large rift valley in africa is lake rukwa.
Photo by Ben Andreas Harding
MID OCEAN RIDGES
- Divergent plates under water creates a mid ocean ridge.
- A great example of this is the mid atlantic ridge
Photo by wockerjabby
CONVERGENT PLATE BOUNDRIES
OCCURS WHEN TWO PLATES CRASH INTO EACHOTHER DESTROYING CRUST
TRENCHES AND VOLCANIC ARCS
- A deep trench is created when continental and oceanic converge
- For example the kermadic trench
- In some cases subduction creats volcanic arcs around the boundry
ISLAND AND VOLCANIC ARCS
- When oceanic plates converge it can result in an island arc
- Another resulting land form is volcanic arcs
- a great example of this is the Aegean island
SUBDUCTION ZONE
- When two plates converge and the more dence plate is pulled into the mantle
- An example of a subduction zone is the Japanese islands
DEEP OCEAN TRENCHES
LONG DEEP UNDERWATER DEPRETION CREATED BY SUBDUCTION.
TRANSFORM PLATE BOUNDRY
CREATED WHEN TWO PLATES SLIDE PAST EACH OTHER
