A Perfect Planet - First Season English Subtitles

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DAVID ATTENBOROUGH: A Perfect' Planet'.

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All life in the oceans depends
on the continuous movement of water.

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There are not five separate oceans
on Earth,

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but just one...

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...whose parts are linked by
powerful, unceasing currents.

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Every drop of seawater on Earth
rides these currents,

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taking a thousand years
to complete a single circuit.

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And where there are currents...

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...there is life.