File:A large blank world map with oceans marked in blue.PNG - Wikipedia

How much of the ocean has been explored? Surprisingly little - Interesting Engineering

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3.1 Factors affecting climate UK Environmental Change Network

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What is the mid-ocean ridge?: Ocean Exploration Facts: NOAA Ocean Exploration

File:A large blank world map with oceans marked in blue.PNG - Wikipedia

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File:A large blank world map with oceans marked in blue.svg - Wikimedia Commons