Plate TectonicsPlate Tectonics

Plate BoundariesPlate BoundariesHeat Transfer

Three types…Three types…

ConductionConduction

RadiationRadiation

ConvectionConvection

Heat transferHeat transfer

ConductionConduction – heat energy transfer – heat energy transfer between objects by direct contact; touching between objects by direct contact; touching (solid)(solid)

RadiationRadiation – heat energy transfer through – heat energy transfer through space (‘air’)space (‘air’); in the form of ‘short waves’; in the form of ‘short waves’

ConvectionConvection – heat energy transfer by – heat energy transfer by movement within a movement within a ‘fluid’;‘fluid’; circular circular movement of “convection currents”movement of “convection currents”

Convection CurrentsConvection Currents

Convection Currents in the Convection Currents in the MantleMantle

Convection Currents – within the asthenosphere (and perhaps the upper mantle),

convection currents are the driving force of

plate movement.

Forces between plates

TensionTension – two plates pulling apart – two plates pulling apart

CompressionCompression – two plates pressing – two plates pressing into each otherinto each other

ShearingShearing - two plates - two plates sliding/grinding past each other.sliding/grinding past each other.

Plate BoundariesPlate Boundaries (divergent boundary) (divergent boundary)

TENSION: TENSION: Divergent boundaryDivergent boundary

Two plates moving Two plates moving awayaway from each from each other creating other creating newnew crust crust

within oceanic area – within oceanic area – sea floor sea floor spreadingspreading

within continental area – within continental area – rift rift valleyvalley

Plate BoundariesPlate BoundariesTENSION: TENSION: Divergent boundariesDivergent boundaries

Within a continent – Within a continent – African Rift, aka Red SeaAfrican Rift, aka Red Sea

Within an ocean – Within an ocean – Mid-Ocean RidgeMid-Ocean Ridge

Progression Progression of a of a

Divergent Divergent BoundaryBoundary

Plate BoundariesPlate Boundaries

COMPRESSION: COMPRESSION:

Convergent Convergent BoundaryBoundary

Two plates moving toward each Two plates moving toward each other; the behavior/results other; the behavior/results depend on the depend on the typetype of crust… of crust…

Ocean – ContinentOcean – Continent convergent boundary convergent boundary – subduction zone (destruction of crust), – subduction zone (destruction of crust), volcanic mountain chainvolcanic mountain chain

Plate BoundariesPlate Boundaries (convergent boundary) (convergent boundary)

Continent – ContinentContinent – Continent convergent convergent boundary - construction (yes boundary - construction (yes construction) of crust, construction) of crust, mountains mountains

Plate BoundariesPlate Boundaries (convergent boundary) (convergent boundary)

India into AsiaIndia into Asia

Plate BoundariesPlate Boundaries (convergent boundary) (convergent boundary)

Ocean – OceanOcean – Ocean convergent boundary – convergent boundary – subduction zone, (destruction of crust), subduction zone, (destruction of crust), volcanicvolcanic island arcisland arc

Plate BoundariesPlate Boundaries(Transform Boundary)(Transform Boundary)

Shearing - Transform boundary

Two plates sliding / grinding past each other

Plate BoundariesPlate Boundaries(Transform Boundary)(Transform Boundary)

Most transform boundaries are associated with Most transform boundaries are associated with ‘fracture zones’ along the mid-ocean ridge‘fracture zones’ along the mid-ocean ridge

Convection Currents in the Convection Currents in the MantleMantle

Plate BoundariesPlate Boundaries(Transform Boundary)(Transform Boundary)

Boundaries for labBoundaries for lab

~ THE END ~~ THE END ~

Keep going…

Extra CreditExtra Credit

Find a recent article relating to Earth Find a recent article relating to Earth Science and write a review & a Science and write a review & a reflection (3-5 paragraphs)… reflection (3-5 paragraphs)…

SneakSneak it to me at BEFORE I leave on it to me at BEFORE I leave on March 6March 6thth, 2013, 2013