An area of land separated by natural borders.
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Additional ocean, based on the Shape of the ocean basins and the Position of the continents.
The answer is Shape and Position.
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~Garebear
Separate Layer it's part of the "Atmosphere layers"
Answer:
The plates are moving towards each other. they usually involve a continental and oceanic plate. The oceanic plate is denser than the continental plate as they move together the oceanic plate is forced under the continental plate. The point at which this happens is called the subduction zone.
Explanation: