The Mariana Trench is deeper than Mount Everest is tall — and was first fully mapped only recently.

A jellyfish moves by pulsing its bell-shaped body.

Fact #506 · Ocean

The Earth's oceans are interconnected.

Fact #314 · Ocean

Sea otters hold hands while sleeping to avoid drifting apart.

Fact #364 · Ocean

Dogs can detect certain diseases through scent.

Fact #1343 · Ocean

The Arctic fox changes fur color with the seasons.

Fact #373 · Ocean

More than 70% of Earth's oxygen is produced by marine plants, primarily phytoplankton.

Fact #3399 · Ocean

The Earth's oceans absorb large amounts of carbon dioxide.

Fact #242 · Ocean

Octopuses have been observed using tools and solving puzzles.

Fact #2232 · Ocean