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Topic 8
Plate Tectonics
Term | Definition |
---|---|
mid-ocean ridge | An undersea mountain chain where new ocean floor is produced or made. A DIVERGENT PLATE BOUNDARY under the ocean. |
sea-floor spreading | The process by which molten material ADDS NEW oceanic crust to the ocean floor. |
subduction | The process by which oceanic crust SINKS beneath a deep-ocean trench and back into the mantle at a CONVERGENT PLATE BOUNDARY. |
ocean trench | An undersea valley that represents one of the DEEPEST parts of ocean. |
divergent boundary | A plate boundary where 2 plates move AWAY from each other. |
convergent boundary | A plate boundary where 2 plates move TOWARDS each other. |
transform boundary | A plate boundary where 2 plates move PAST each other in OPPOSITE directions. |