A schematic roadmap of the ocean’s circulation: Each ocean basin contains large spinning gyres, driven by Earth’s rotation and winds. The gyres are mostly self-contained, so that waters circulate within them rather than flowing between them. Small Swirling eddies, which can be found everywhere in the ocean, provide some stirring between the gyres. A global circulation known as the Ocean Conveyor Belt also provides a connection between the gyres, propelling warm surface waters and deep cold waters around the world. (Illustration by Natalie Renier, © Woods Hole Oceanographic Institution)
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