Phytoplankton in the ocean produce about half of the oxygen we breathe.

The deep ocean floor is covered with fine sediment known as ooze.

Fact #1422 · Ocean

Dolphins surf ocean waves purely for fun — one of the clearest signs of play behavior in animals.

Fact #5979 · Ocean

Deep-sea creatures often have bioluminescent organs for communication.

Fact #884 · Ocean

Sharks predate trees by about 90 million years — they've been swimming Earth's oceans for 450 million years.

Fact #5120 · Ocean

The largest living structure on Earth is the Great Barrier Reef.

Fact #2632 · Ocean

Whale songs can travel thousands of miles through the ocean.

Fact #5122 · Ocean

The Mariana Trench reaches depths of nearly 36,000 feet.

Fact #1388 · Ocean

Many deep-sea animals lack strong pigmentation.

Fact #1409 · Ocean