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Ocean - Wikipedia
Ocean | Definition, Distribution, Map, Formation, & Facts | Britannica
Oceans—facts and information - National Geographic
All About the Ocean - National Geographic Society
What are the 5 Oceans of the World? - Earth How
Ocean Definition & Meaning - Merriam-Webster
Ocean - Education | National Geographic Society
The Ocean | National Oceanic and Atmospheric Administration
Ocean Facts and Species - Oceanic Society
ocean summary | Britannica