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plate tectonics

TermDefinition
ocean treanch an under sea valley that repersents one of the deepest parts of the ocean
mid ocean ridge an under sea mountain chain where new ocean floor is produced
sea floor spreading the process by which molten material adds new oceanic crust to the ocean floor
subduction oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundry
plate boundry area where two or more tectonic plates bump into each other
continental crust the relatively thick part of the earths crust that forms the large landmasses.
continental shelf `the edge of a continent that lies under the ocean
converged plate boundry where two plates are moving toward each other
divergent plate boundry a plate boundry where two plates move away from each other.
transform boundry a plate boundry where two plates move past each other in oppisite directions.
earthquake the shaking that results from the movement of beneath the earths surface
fracture zone a long narrow rift on the ocean floor separating areas of differing depth
seismic wave vibrations that travel throgh earth carrying the energy released during a earthquake
magnitude the measure of a earthquake strenth based on seismic waves
tsunami a giant wave usually caused by a earthquake
hotspot a large plume of hot mantle material rising from deep within the earth
metamorphic rock a type of rock that forms from an existing rock that is changed by heat pressure or chemical reactions
volcano a weak spot in the crust where the magma has come to the surface
dormant a volcano that is not currently active but able to become active in the future
extinct a volcano that is no longer active and unlikely to erupt again
Created by: user-1774595
 

 



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