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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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At some point, we all had to memorize the names of Earth's oceans.

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But in reality all this water is connected.

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So how do we know where one body begins and another ends?

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Just follow the trash, because the location of seafaring garbage can be used to define the oceans' borders.

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That's according to a study in the journal Chaos.

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Historically speaking, the planet's waters have been partitioned into discrete oceans for reasons that are geographical, historical, even cultural.

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To approach the problem from a more anatomical perspective, researchers came up with a model of how surface waters move.

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Which is where the rubbish comes in.

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Flotillas of flotsam are formed by currents that gather the garbage in large floating patches.

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But the currents also create barriers that minimize mixing between different ocean regions.

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By modeling these currents, researchers have redefined the borders of the ocean basins based on how readily their waters mix.

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They find, for example, that a sliver of the Indian Ocean is really part of the south Pacific.

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The work should help track ocean debris or even the spread of spilled oil.

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And it could change the way we see our seas.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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