Tectonic Plates
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| Tectonic Plates | Huge pieces of lithosphere that slowly move on the asthenosphere and consist of the crust and the rigid, uppermost part of the mantle
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| North American Plate | A tectonic plate division of the lithosphere that includes the continental crust of Greenland, North America, Siberia, and the surrounding oceanic crust
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| Eurasian Plate | A tectonic plate division of the lithosphere, including most of the landmasses of Europe and Asia
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| African Plate | A tectonic plate division of the lithosphere that includes the continental crust of Africa and the surrounding oceanic crust
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| South American Plate | A tectonic plate division of the lithosphere that includes the continental crust of South America and the oceanic crust extending to the Mid-Atlantic ridge
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| Indo-Australian Plate | A tectonic plate division of the lithosphere that includes the continental crust of India and Australia and the surrounding oceanic crust
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| Pacific Plate | A tectonic plate division of the lithosphere that is composed entirely of oceanic crust and lies beneath the Pacific Ocean
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| Antarctic Plate | A tectonic plate division of the lithosphere that includes the continental crust of Antarctica and the surrounding oceanic crust.
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| Density of Plates | Density is the amount of matter in a given space or volume; oceanic crust is thinner, but denser, than continental crust
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| Crustal Rock Material | Crust can be either oceanic, which is thin and dense, or continental, which is thick and less dense.
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| Plate Boundary | The place where two different plates have
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| contact. |
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| Convergent Boundary | Occurs when two tectonic plates move toward
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| each other and collide |
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| Subduction | Subduction occurs when one plate is denser than another and is forced below as the two plates converge at their boundary. Oceanic trenches are formed by the subduction of an oceanic plate
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| Volcanic Eruptions | Events in which molten rock spews out from the mantle to the surface of Earth as ash, lava, and gases; major geological events that occur when a dense plate subducts below a less dense plate.
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| Mountain Building | Major geological event that occurs when continental plates of equal density converge, resulting in mountain chains.
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| Divergent Boundary | Occurs when two tectonic plates move away
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| from each other |
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| Spreading Ridges | Ridges formed from new crustal material
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| at diverging oceanic plate boundaries |
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| Ocean Basin | An area of oceanic crust covered by sea water
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| and surrounded by areas of continental crust. |
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| Transform Boundary | Occurs when two tectonic plates slide
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| past each other. |
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| Earthquakes | Major geological events that occur when plates shift suddenly and release stored energy; frequent occurrences along all types of plate boundaries.
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