Oceans

Obama's national monuments are a big deal

Watch the first video of the rare ruby sea dragon

Visit Antarctica's colorful underwater world

2016 was the Arctic's warmest year on record 'by far'

Unknown 'ghost octopus' found 2.6 miles deep

Bizarre Mariana Trench 'alien call' identified

Killer whales vs. shark: Drone footage shows rare attack

The Earth's mountains, rocks and water bodies are ancient. Do you know how old they are?

10 things you didn't know about seahorses

Curious 'castaway' makes imaginations run wild

Like bees of the sea, plankton pollinate plants

Beautiful feather stars bring back the '70s

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