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Drifting Continents

Bonnie Branch 6th Grade - 4-3 / 4-4 Drifting Continents / Sea-Floor Spreading

Pangea The name of the single landmass that broke apart about 300 million years ago to create today's continents.
continental drift The hypothesis that the continents slowly move across Earth's surface.
fossil Any trace of an ancient organism preserved in rock.
mid-ocean ridge The longest chain of mountains in the world found under the sea where ocean floor is produced.
sonar A system that determines the distance of an object under water by recording echoes of sound waves.
sea-floor spreading The process by which molten material adds new oceanic crust to the ocean floor.
deep-ocean trench Deep underwater canyons on the ocean floor where crust slowly sinks toward the mantle
subduction The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle.
Created by: kjanelli