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Plate tectonics
Plate tectonics describes how the Earth's crust is broken into plates that move around on the mantle. There are two types of plates - ocean plates under the oceans and continental plates under the continents. Plates meet at boundaries where they either move apart, collide together, or slide past one another. The movement of convection currents in the mantle is the driving force behind plate tectonics.
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Plate tectonics
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- 3. What is PlateTectonicsWhat is Plate Tectonics • The Earth’s crust and upper mantle are broken into sections called plates • Plates move around on top of the mantle like rafts
- 5. 2 Types ofPlates2 Types of Plates • Ocean plates - plates below the oceans • Continental plates - plates below the continents
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- 7. Divergent BoundariesDivergent Boundaries •Boundary between two plates that are moving apart or rifting • RIFTING causes SEAFLOOR SPREADING
- 8. Features of DivergentFeaturesof Divergent BoundariesBoundaries • Mid-ocean ridges • rift valleys • fissure volcanoes
- 12. Convergent BoundariesConvergent Boundaries •Boundaries between two plates that are colliding • There are 3 types…
- 13. Type 1Type 1 •Ocean plate colliding with a less dense continental plate • Subduction Zone: where the less dense plate slides under the more dense plate • VOLCANOES occur at subduction zones
- 15. Andes Mountains,Andes Mountains, SouthAmericaSouth America
- 16. Type 2Type 2 •Ocean plate colliding with another ocean plate • The less dense plate slides under the more dense plate creating a subduction zone called a TRENCH
- 18. Aleutian Islands, AlaskaAleutianIslands, Alaska
- 19. Type 3Type 3 •A continental plate colliding with another continental plate • Have Collision Zones: –a place where folded and thrust faulted mountains form.
- 22. Transform Fault BoundariesTransformFault Boundaries • Boundary between two plates that are sliding past each other • EARTHQUAKES along faults
- 24. San Andreas Fault,CASan Andreas Fault, CA
- 25. Causes of PlateCausesof Plate TectonicsTectonics
- 26. Convection CurrentsConvection Currents •Hot magma in the Earth moves toward the surface, cools, then sinks again. • Creates convection currents beneath the plates that cause the plates to move.