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6th

Tectonic Plates

TermDefinition
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
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
Eurasian Plate A tectonic plate division of the lithosphere, including most of the landmasses of Europe and Asia
African Plate A tectonic plate division of the lithosphere that includes the continental crust of Africa and the surrounding oceanic crust
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
Indo-Australian Plate A tectonic plate division of the lithosphere that includes the continental crust of India and Australia and the surrounding oceanic crust
Pacific Plate A tectonic plate division of the lithosphere that is composed entirely of oceanic crust and lies beneath the Pacific Ocean
Antarctic Plate A tectonic plate division of the lithosphere that includes the continental crust of Antarctica and the surrounding oceanic crust.
Density of Plates Density is the 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 and dense, or continental, which is thick and less dense.
Plate Boundary The place where two different plates have
contact.
Convergent Boundary Occurs when two tectonic plates move toward
each other and collide
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
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.
Mountain Building Major geological event that occurs when continental plates of equal density converge, resulting in mountain chains.
Divergent Boundary Occurs when two tectonic plates move away
from each other
Spreading Ridges Ridges formed from new crustal material
at diverging oceanic plate boundaries
Ocean Basin An area of oceanic crust covered by sea water
and surrounded by areas of continental crust.
Transform Boundary Occurs when two tectonic plates slide
past each other.
Earthquakes Major geological events that occur when plates shift suddenly and release stored energy; frequent occurrences along all types of plate boundaries.
Created by: whiteley64