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THE SEVEN SEAS ARE A lie. The bodies of water that the traditional title encompasses have changed over the centuries, but today include the North and South Atlantic, North and South Pacific, Arctic, Indian, and Southern. All of them are actually oceans. Seas, on the other hand, are by definition much smaller and at least partly enclosed by land think the Mediterranean or Sea of Japan. (The North Atlantic’s Sargasso Sea, which is defined by the ocean currents that surround it, is an exception.) Geologists would go a step further, and categorize oceans based on the presence of oceanic crust: basalt created when Earth’s mantle coughs up magma along mid-ocean ridges. When continents, made of granite-based continental crust, tear apart, mid-ocean ridges sometimes emerge in that opening and act like conveyor belts, churning out magma that quickly cools, becoming basalt-based ocean floor. Mid-ocean ridges are how oceans are born, grow, and mature.

Red seaDjibouti generalNico augustinNature communicationsOcean research kielHelmholtz centerSouth atlanticSouth pacificNorth atlanticSargasso seaOcean researchசிவப்பு கடல்இயற்கை தகவல்தொடர்புகள்கடல் ஆராய்ச்சி கேல்தெற்கு அட்லாண்டிக்தெற்கு பெஸிஃபிக்