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Plate Tectonics Plate Boundaries Heat Transfer Three types… Conduction Radiation Convection Heat transfer Conduction – heat energy transfer between objects by direct contact; touching (solid) Radiation – heat energy transfer through space (‘air’); in the form of ‘short waves’ Convection – heat energy transfer by movement within a ‘fluid’; circular movement of “convection currents” Convection 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. 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: Divergent boundary Two plates moving away from each other creating new crust within oceanic area – sea floor spreading within continental area – rift valley Plate Boundaries TENSION: Divergent boundaries Within a continent – African Rift, aka Red Sea Within an ocean – Mid-Ocean Ridge Progression of a Divergent Boundary Plate Boundaries COMPRESSION: Convergent Boundary Two plates moving toward each other; the behavior/results depend on the type of crust… Plate Boundaries (convergent boundary) Ocean – Continent convergent boundary – subduction zone (destruction of crust), volcanic mountain chain Plate Boundaries (convergent boundary) Continent – Continent convergent boundary - construction (yes construction) of crust, mountains India into Asia Plate Boundaries (convergent boundary) Ocean – Ocean convergent boundary – subduction zone, (destruction of crust), volcanic island arc Plate Boundaries (Transform Boundary) Shearing Transform boundary Two plates sliding / grinding past each other Plate Boundaries (Transform Boundary) Most transform boundaries are associated with ‘fracture zones’ along the mid-ocean ridge Convection Currents in the Mantle Plate Boundaries (Transform Boundary) Boundaries for lab ~ THE END ~ Keep going… Extra Credit Find a recent article relating to Earth Science and write a review & a reflection (3-5 paragraphs)… Sneak it to me at BEFORE I leave on March 6th, 2013