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TECTONIC PLATES

6.10CD TECTONIC PLATES

TermDefinition
TECTONIC PLATES Huge pieces of lithosphere that slowly move on the asthenosphere & consist of the crust & the rigid, uppermost part of the mantle.
NORTH AMERICAN PLATE Tectonic plate division of the lithosphere that includes the continental crust of Greenland, N. America, Siberia, & the surrounding oceanic crust.
EURASIAN PLATE Tectonic plate division of the lithosphere, including most of the landmasses of Europe & Asia.
AFRICAN PLATE Tectonic plate division of the lithosphere that includes the continental crust of Africa & the surrounding oceanic crust.
SOUTH AMERICAN PLATE Tectonic plate division of the lithosphere that includes the continental crust of S. America & the oceanic crust extending to the Mid-Atlantic Ridge.
INDO-AUSTRALIAN PLATE Tectonic plate division of the lithosphere that includes the continental crust of India & Australia & the surrounding oceanic crust.
PACIFIC PLATE Tectonic plate division of the lithosphere that's composed entirely of oceanic crust & lies beneath the Pacific Ocean.
ANTARCTIC PLATE Tectonic plate division of the lithosphere that includes the continental crust of Antarctica & the surrounding oceanic crust.
DENSITY OF PLATES Amount of matter in a given space or volume; oceanic crust is thinner, but denser than continental crust.
CRUSTAL ROCK MATERIAL Crust can be either oceanic, which is thin & dense, or continental, which is thick & less dense.
PLATE BOUNDARY Place where 2 different plates have contact.
CONVERGENT BOUNDARY Occurs when 2 tectonic plates move toward each other & collide; "CON-" = WITH.
SUBDUCTION Process in which a denser plate is pushed downward beneath a less dense plate when plates converge; occurs at continental to oceanic boundaries & oceanic to oceanic boundaries.
VOLCANIC ERUPTIONS Events in which molten rock spews out from the mantle to Earth's surface as ash, lava, & gases; major geological events that occur when a dense plate subducts below a less dense plate.
MOUNTAIN BUILDING Major geological event that occurs when continental plates of equal density converge, resulting in mountain chains.
DIVERGENT BOUNDARY Occurs when 2 tectonic plates move away from each other; "DI-" = TWO.
SPREADING RIDGES Ridges formed from new crustal material at diverging oceanic plate boundaries.
OCEAN BASIN Area of oceanic crust covered by seawater & surrounded by areas of continental crust.
TRANSFORM BOUNDARY Occurs when 2 tectonic plates slide past each other.
EARTHQUAKES Major geological events that occur when plates shift suddenly & release stored energy; frequent occurrences along all types of plate boundaries.
Created by: trauberk
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