The Great Barrier Reef supports thousands of marine species.

There is a river in the ocean — the Gulf Stream moves more water than all of Earth's rivers combined.

Fact #3404 · Ocean

Blue whales can grow longer than 90 feet.

Fact #341 · Ocean

Many deep-sea fish have transparent or nearly invisible bodies.

Fact #1387 · Ocean

Penguins use their flippers to propel themselves underwater.

Fact #1238 · Ocean

The Earth's crust is thinner beneath oceans.

Fact #127 · Ocean

Sea otters hold hands while sleeping so they don't drift apart.

Fact #3229 · Ocean

The Earth's tilt is responsible for seasonal climate patterns.

Fact #222 · Ocean

Plankton form the base of many marine food chains.

Fact #663 · Ocean