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Plate boundaries

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Dolora Ramos

There are three main types of plate boundaries: 1) transform boundaries where plates slide horizontally past one another like the San Andreas Fault, 2) convergent boundaries where plates collide and one is subducted beneath the other in oceanic trenches or mountain building, and 3) divergent boundaries where plates spread apart like mid-ocean ridges and new crust is formed through volcanic activity.

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Plate Boundaries
Plate Boundaries • A plate boundary is the region where plates meet. The plates may either collide, move away from each other, or slip/slide past each other. Three types of Plate Boundaries: 1. Transform Plate Boundary (or strike slip fault boundary) 2. Convergent Plate Boundary (destructive plate boundary) 3. Divergent Plate Boundary (or rift zone)
Earth Plate Boundaries
1. Transform Plate Boundary • Motion is lateral sliding; no major effect and no volcanic activity. • Plates move past each other, faults are formed. • The plate slide past each other horizontally. This is a type of boundary that cuts through California, the well-known “San Andreas Fault”.
example: San Andreas Fault of California • The San Andress fault zone, which is about 1,300 km. long and and is tens kilometers wide,slices through two thirds of the lenght of California.
2. Convergent Plate Boundary • The motion is subduction; destructive when oceanic lithosphere is destroyed and there is evidence of volcanic activity. • Convergent plate boundaries are often the sites of major volcanoes. A volcanic activity is driven by the heating up of the plate that is descending back into the mantle, causing it, and part of overriding plate, to melt.
Convergent Plate Boundary • Plates moves toward one another • Sea floor destroyed • Forms trenches and volcanic island arcs
3. Divergent Plate Boundary • Motion is spreading; constructive and oceanic lithosphere is created and there is evidence of volcanic activity. For the most part, these boundaries are located on the ocean floors, that forms mid-ocean ridges. • Boundaries where the earth’s tectonic plates are moving apart.
Divergent Plate Boundaries
3 Types of Plate Boundaries (summary)
Thank you for listening Be ready for a short quiz

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Plate boundaries

  • 2. Plate Boundaries • A plate boundary is the region where plates meet. The plates may either collide, move away from each other, or slip/slide past each other. Three types of Plate Boundaries: 1. Transform Plate Boundary (or strike slip fault boundary) 2. Convergent Plate Boundary (destructive plate boundary) 3. Divergent Plate Boundary (or rift zone)
  • 4. 1. Transform Plate Boundary • Motion is lateral sliding; no major effect and no volcanic activity. • Plates move past each other, faults are formed. • The plate slide past each other horizontally. This is a type of boundary that cuts through California, the well-known “San Andreas Fault”.
  • 5. example: San Andreas Fault of California • The San Andress fault zone, which is about 1,300 km. long and and is tens kilometers wide,slices through two thirds of the lenght of California.
  • 6. 2. Convergent Plate Boundary • The motion is subduction; destructive when oceanic lithosphere is destroyed and there is evidence of volcanic activity. • Convergent plate boundaries are often the sites of major volcanoes. A volcanic activity is driven by the heating up of the plate that is descending back into the mantle, causing it, and part of overriding plate, to melt.
  • 7. Convergent Plate Boundary • Plates moves toward one another • Sea floor destroyed • Forms trenches and volcanic island arcs
  • 8. 3. Divergent Plate Boundary • Motion is spreading; constructive and oceanic lithosphere is created and there is evidence of volcanic activity. For the most part, these boundaries are located on the ocean floors, that forms mid-ocean ridges. • Boundaries where the earth’s tectonic plates are moving apart.
  • 10. 3 Types of Plate Boundaries (summary)
  • 11. Thank you for listening Be ready for a short quiz

Editor's Notes

  1. Lithosphere - the rigid outer part of the earth, consisting of the crust and upper mantle. Asthenosphere - the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur. Crust – is the outer layer of the earth Fault Line - discontinuity in a volume of rock, across which there has been significant displacement as a result of rock mass movement.  Tectonic – a. pertaining to the structure of the earth's crust. b. referring to the forces or conditions within the earth that cause movements of the crust.
  2. Lithosphere - the rigid outer part of the earth, consisting of the crust and upper mantle. Asthenosphere - the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur. Crust – is the outer layer of the earth Fault Line - discontinuity in a volume of rock, across which there has been significant displacement as a result of rock mass movement.  Tectonic – a. pertaining to the structure of the earth's crust. b. referring to the forces or conditions within the earth that cause movements of the crust.
  3. Tectonic – a. pertaining to the structure of the earth's crust. b. referring to the forces or conditions within the earth that cause movements of the crust. Lithosphere - the rigid outer part of the earth, consisting of the crust and upper mantle. Asthenosphere - the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur. Crust – is the outer layer of the earth Fault Line - discontinuity in a volume of rock, across which there has been significant displacement as a result of rock mass movement.