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The Atlantic Ocean seafloor has what appear to be "stretch marks" or creases branching out horizontally from the center of the ocean. The seafloor deepens (generally) from both sides up to 20,000 ft. until a central upward ridge is formed (Mid-Atlantic Ridge), running up the middle of the ocean between the western and eastern continents. In some places this ridge is only a few thousand feet deep. The Atlantic also has a few deep basins scattered throughout that are substantially deeper than the surrounding ocean.

Some researchers report core samples taken of the seafloor crust show the age of the seafloor increasing as you travel away from the coastline, suggesting the seafloor has expanded outward from the central ridge over time.

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