plate tectonics
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Plate Tectonics. The Crust. Outermost layer 5 – 70 km thick Solid, rigid. The Mantle. Layer of Earth between the crust and the core Made up of 3 parts. The Core. Below the mantle and to the center of the Earth Outer core = liquid Inner core = solid. Plate Tectonics.

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Presentation Transcript
the crust
The Crust
  • Outermost layer
  • 5 – 70 km thick
  • Solid, rigid
the mantle
The Mantle
  • Layer of Earth between the crust and the core
  • Made up of 3 parts
the core
The Core
  • Below the mantle and to the center of the Earth
  • Outer core = liquid
  • Inner core = solid
plate tectonics1
Plate Tectonics
  • Pieces of the lithosphere that move around
  • Each plate has a name
  • Float on top of mantle similar to ice cubes in a bowl of water
lithosphere
Lithosphere
  • Uppermost part of the mantle, along the overlying crust
  • Break into pieces called plates
  • Overlies a weaker region of the mantle known as the asthenosphere
    • Temperature/pressure in the uppermost asthenosphere, creates a weak zone that allows the lithosphere to be detached=movement
how plates move
How Plates Move

http://pubs.usgs.gov/gip/dynamic/unanswered.html

sea floor spreading
Sea Floor Spreading
  • Mid Ocean Ridges – underwater mountain chains that run through the Earth’s Basins
  • Magma rises to the surface and solidifies and new crust forms
  • Older Crust is pushed

farther away from the ridge

plate boundaries
Plate Boundaries
  • Interactions among individual plates, creating deformation, occur along their boundaries
  • Plates are bounded by three distinct types of boundaries
    • These boundaries are determined by the type of movement they exhibit
divergent boundaries
Divergent Boundaries
  • Constructive margins
  • Two plates move apart, resulting in an upwelling of material from the mantle to create new sea floor
    • Seafloor spreading, creates new sea floor, magma rises when spreading
    • Older Crust is pushed farther away from the ridge
slide15

Arabian Plate

Red Sea

African Plate

convergent boundaries
Convergent Boundaries
  • Destructive margins
  • Two plates move together, resulting in oceanic lithosphere descending (trench) beneath an overriding plate (subduction zones)
      • eventually to be recycled into the mantle or create mountain system
    • Oceanic-Continental, continental volcanic arc
    • Oceanic-Oceanic, volcanic island arc
    • Continental-Continental, collision mountains
convergent boundary oceanic continental
Convergent Boundary – Oceanic & Continental

http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

convergent boundary oceanic oceanic
Convergent Boundary – Oceanic & Oceanic

Note – plates are reversed

http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

convergent boundaries continental
Convergent Boundaries - Continental

http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

slide20

EurasianPlate

Indian Plate

transform fault boundaries
Transform Fault Boundaries
  • Conservative margins
  • Two plates grind past one another without production or destruction of lithosphere

San Andreas Fault

review
Review
  • Name the 3 main layers of the Earth
  • What is a tectonic plate?
  • What was Pangaea?
  • What is Sea-Floor spreading?
  • Name the three different types of plate boundaries and how they move.
  • What is found at each type of plate boundary?
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