The Earth's poles experience extreme seasonal variations in sunlight.

Glacial periods caused sea levels to drop significantly.

Fact #748 · Ocean

Some deserts were once oceans.

Fact #2661 · Ocean

Octopuses have rectangular pupils that give them nearly 360-degree vision.

Fact #3844 · Ocean

Octopuses can squeeze through tight spaces due to their soft bodies.

Fact #869 · Ocean

Certain dolphins cooperate to herd fish in coordinated groups.

Fact #1301 · Ocean

Some whales communicate across vast distances underwater.

Fact #228 · Ocean

Some deep-sea octopuses brood their eggs for years.

Fact #1413 · Ocean

The compass improved navigation at sea.

Fact #1551 · Ocean