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Oceans

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Dunkleosteus

STRONG SWIMMER  The armored, jawed fish Dunkleosteus was a top ocean predator around 380 million to 360 million years ago, during the late Devonian Period. 

booby chick

WILD WASTE  Nitrogen from the guano of seabirds, such as this red-footed booby chick, leaches into coral ecosystems and helps them stay robust.

world map of submarine fiber-optic cables

MOTION OF THE OCEAN FLOOR  The network of submarine fiber-optic cables that deliver work e-mails and cat videos to computers around the world could double as undersea earthquake detectors. Existing cables are shown in purple; planned cables are in blue.

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