Plate Boundary Project Roselyn Chavez

Divergent boundaries/ Oceanic-Oceanic :

  • Divergent boundaries -- where new crust is generated as the plates pull away from each other.
  • oceanic - oceanic divergent is were an oceanic plate is subducted under another plate which causes a deep oceanic trench, and underwater volcanos form.
  • Plate tectonics is the geologic theory that Earth's crust is made up of rigid plates that "float" on the surface of the planet. Tectonics comes from the Greek word meaning "builder." The movement of the plates toward or away from each other either directly or indirectly creates the major geologic features at Earth's surface.
  • An example of Oceanic Diversion is the Mid-Atlantic Ridge. Its a mountain range under water that was created over 200 million years ago. It stretches from the Arctic Ocean to the southern tip of Africa. This segment of the global mid ocean ridge system that encircles the earth. The Mid-Atlantic ridge system moves apart an average 2.5 centimeters a year. This process has been going on for millions of years and has cause the ocean to grow. Its gotten so big that now the ocean stretches as far from Europe, Africa to America.
  1. How do the plate move? Move away
  2. What forms? Mid-Ocean-Ridge or Continental Rift
  3. Where is it happening? Mid-Atlantic-Ridge
  4. Type of Stress? Tension

Divergent Boundaries/ Continental-Continental

  • A divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.
  • Divergent boundaries within continents initially produce rifts which eventually become rift valleys. Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges. Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill.
  1. How do the plate move? Move away
  2. What forms? Continental Rift
  3. Where is it happening? East African Rift Valley
  4. Type of Stress? Tension
Example of a Divergent Boundary

Convergent Boundaries/ Continental – Continental :

  • Is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
  • As a result of pressure, friction, and plate material melting in the mantle, earthquakes and volcanoes are common near convergent boundaries. When two plates move towards one another, they form either a subduction zone or a continental collision.
  • In a subduction zone, the subducting plate, which is normally a plate with oceanic crust, moves beneath the other plate, which can be made of either oceanic or continental crust. During collisions between two continental plates, large mountain ranges, such as the Himalayas are formed.
  1. How do the plate move? Move toward one another and collide
  2. What forms? Mountain Ranges
  3. Where is it happening? Himalayas
  4. Type of Stress? Compression
Example of Convergent Boundary

Transform Boundaries

  • Transform boundaries are places where plates slide sideways past each other.
  • At transform boundaries lithosphere is neither created nor destroyed. Many transform boundaries are found on the sea floor, where they connect segments of diverging mid-ocean ridges. California's San Andreas fault is a transform boundary.
  1. How do the plate move? where plates slide sideways past each other
  2. What forms? San Andreas Fault in California
  3. Where is it happening? Mid-ocean ridges
  4. Type of Stress? Tension

Mid- Ocean- Ridge

  • A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.
  • This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
  • The mid-ocean ridges of the world are connected and form a single global mid-oceanic ridge system that is part of every ocean, making the mid-oceanic ridge system the longest mountain range in the world, with a total length of about 60,000 km.

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