Download - Plate Tectonics. Plate Boundaries Heat Transfer Three types- 1.Conduction 2.Radiation 3.Convection
Plate TectonicsPlate Tectonics
Plate BoundariesPlate Boundaries
Heat TransferHeat Transfer
Three types- Three types-
1.1.ConductionConduction
2.2.RadiationRadiation
3.3.ConvectionConvection
Heat transferHeat transfer
1.1. ConductionConduction – heat energy transfer between objects by – heat energy transfer between objects by
direct contact; touching direct contact; touching (solid)(solid)
2.2. 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’
3.3. ConvectionConvection – heat energy transfer by movement of air – heat energy transfer by movement of air
or a or a ‘fluid’ ‘fluid’ by circular movement of “convection circular movement of “convection
currents”currents”
Convection CurrentsConvection Currents
Convection Currents in the Mantle
Convection Currents – within the asthenosphere (and perhaps the upper mantle), convection currents are the driving force of plate movement.
Convection Currents in the Mantle
Forces Between Plates• Tension – two plates pulling apart
• Compression – two plates pressing into each other
• Shearing - two plates sliding/grinding past each other.
Plate Boundaries (divergent boundary)
TENSION FORCE: Divergent boundary
Two plates moving away from each other creating new crust
within oceanic area – sea floor spreading within continental area – rift valley
Plate BoundariesTENSION: Divergent boundaries
Within a continent – African Rift, Within a continent – African Rift, aka Red Seaaka Red Sea
Within an ocean – Mid-Ocean RidgeWithin an ocean – Mid-Ocean Ridge
Progression of a Progression of a Divergent BoundaryDivergent Boundary
Plate BoundariesPlate Boundaries
COMPRESSION: COMPRESSION:
Convergent BoundaryConvergent Boundary
Two plates moving toward each other; Two plates moving toward each other; the behavior/results depend on the the behavior/results depend on the typetype of crust… of crust…
Ocean – ContinentOcean – Continent convergent boundary – subduction convergent boundary – subduction zone (destruction of crust), zone (destruction of crust), volcanic mountain chainvolcanic mountain chain
Plate BoundariesPlate Boundaries (convergent boundary) (convergent boundary)
Continent – Continent convergent boundary - construction (yes construction) of crust, mountains
Plate Boundaries (convergent boundary)
Plate Boundaries (convergent boundary)
Ocean – Ocean convergent boundary – subduction zone, (destruction of crust), volcanic island arc
Plate BoundariesPlate Boundaries(Transform Boundary)(Transform Boundary)
Transform boundary - Shearing
• Two plates sliding / grinding past each other
Plate BoundariesPlate Boundaries(Transform Boundary)(Transform Boundary)
Plate BoundariesPlate Boundaries(Transform Boundary)(Transform Boundary)