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Panthalassa, also known as the Panthalassic or Panthalassan Ocean, (from Greek Ïá¾¶Î½ all and Î¸Î¬Î»Î±ÏÏÎ± sea), was the superocean that surrounded the supercontinent Pangaea. During the PaleozoicâMesozoic transition c. 250 Ma it occupied almost 70% of Earth's surface.
the continental margin is the zone of the ocean floor that separates the thin oceanic crust from thick continental crust together the continental shelf continental slope and continental rise are called continental margin continental margins constitute about 28 % of the oceanic areahe continental margin is the zone of the ocean floor that separates the thin oceanic crust from thick continental crust together the continental shelf continental slope and continental rise are called continental margin continental margins constitute about 28 % of the oceanic area