Plate Tectonics
Published on Nov 18, 2015
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PRESENTATION OUTLINE
Plate tectonics is the theory that pieces of the earth's lithosphere are in slow constant motion, driven by convection
currents in the mantle.
CONVECTION CURRENTS
CONVECTION CURRENTS IN THE MANTLE CAN CAUSE PLATE MOVEMENT.
GRAVITY
CAUSES MORE DENSE PLATES TO SINK INTO THE SUBDUCTION ZONE.
Rift Valley may be created as a result of a Divergent boundary
Mid-ocean ridges may be formed from a Divergent Plate Boundary.
CONVERGENT PLATE BOUNDARY
PLACE WHERE TWO PLATES COLLIDE
OCEAN VS. CONTINENT
TRENCH WITH A VOLCANIC ARCH MAY FORM
OCEAN VS. OCEAN
TRENCH WITH ISLAND ARCH OR UNDERWATER VOLCANIC ARCH
Subduction zone: process by which ocean crust sinks beneath a deep ocean trench and back into the mantle.
Photo by Ken Lund
Deep Ocean Trench: Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches.
Photo by NASA: 2Explore
EXAMPLE OF DEEP OCEAN TRENCH
MIDDLE AMERICA TRENCH
TRANSFORM PLATE BOUNDARY
- Relative motion is predominantly horizonal
- End abruptly and are connected on both ends to other faults
- Plates slide past each not creating or destroying plates
Photo by docentjoyce
EXAMPLE OF A TRANSFORM BOUNDARY
SAN ANDREAS
