1 / 29

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….

liliha
Download Presentation

Geology Rocks!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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……

More Related