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Geology Rocks!

Geology Rocks!. “Come together, right now, over me…..” (Convergent Boundaries). 6th Science Std: 1. We have looked at divergent plate boundaries. Now let’s look at what happens when plates come together. Lets look at Convergent Plates…. There are 3 types of convergent plates….

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Geology Rocks!

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  1. Geology Rocks! “Come together, right now, over me…..” (Convergent Boundaries) 6th Science Std: 1

  2. We have looked at divergent plate boundaries

  3. Now let’s look at what happens when plates come together Lets look at Convergent Plates…..

  4. There are 3 types of convergent plates…. Ocean - Continent Ocean - Ocean Continent - Continent

  5. Ocean-Continent Convergent Zone…. When continental and oceanic plates collide the thinner and more denseoceanic plate is forced down by the thicker and less densecontinental plate.

  6. Ocean-Continent Convergent Zone…. The oceanic plate is forced down into the mantle in a process known as "subduction"

  7. Ocean-Continent Convergent Zone…. At a depth of about 100 miles (160 km) a process of partial melting begins

  8. Ocean-Continent Convergent Zone…. The buoyant magma chambers begin a slow ascent through the overlying materials

  9. Ocean-Continent Convergent Zone…. If a magma chamber rises to the surface without solidifying the magma will break through and make a volcano

  10. Ocean-Continent Convergent Zone…. The Washington-Oregon coastline of the United States is an example of this type of convergent plate boundary.

  11. Effects of Ocean-Continent Convergent Zone…. a zone of earthquake activity that is shallow along the continent margin but deepens beneath the continent

  12. Effects of Ocean-Continent Convergent Zone…. an ocean trench immediately off shore of the continent

  13. Effects of Ocean-Continent Convergent Zone…. a line of volcanic eruptions a few hundred miles inland from the shoreline

  14. Ocean-Ocean Convergent Zone…. Normally the older plate will subduct because of its higher density When a convergent boundary occurs between two oceanic plates one of those plates will subduct beneath the other

  15. Ocean-Ocean Convergent Zone…. the magma is lower in density than the surrounding rock material and ascends by melting and fracturing its way through the overlying rock material at a depth of about 100 miles (150 km) the plate begins to melt

  16. Ocean-Ocean Convergent Zone…. Magma chambers that reach the surface break through to form a volcanic eruption cone

  17. Ocean-Ocean Convergent Zone…. Japan, the Aleutian islands and the Eastern Caribbean islands are examples of islands formed through this type of plate boundary

  18. Ocean-Ocean Convergent Zone Effects…. a zone of progressively deeper earthquakes

  19. Ocean-Ocean Convergent Zone Effects…. an oceanic trench

  20. Ocean-Ocean Convergent Zone Effects…. a chain of volcanic islands

  21. Continent-Continent Convergent Zone…. The two thick continental plates collide and both of them have a density that is much lower than the mantle, which prevents or limits subduction

  22. Continent-Continent Convergent Zone…. The intense compression can also cause extensive folding and faulting of rocks within the two colliding plates making very high mountains

  23. Continent-Continent Convergent Zone…. The Himalaya Mountain Range is the best active example of this type of plate boundary (where India Plate crashed into Eurasian Plate)

  24. Continent-Continent Convergent Zone Effects…. intense folding and faulting of crust

  25. Continent-Continent Convergent Zone Effects…. shallow earthquake activity, shortening and thickening of the plates within the collision zone.

  26. The area where the two plates meet is called a Suture Zone

  27. In summary……

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