The deep-ocean zone below 1,000 m is called the midnight zone — no sunlight reaches it.

Certain fish can survive in oxygen-poor water.

The Earth's oceans cover more than 70% of the planet's surface.

The Great Barrier Reef supports thousands of marine species.

The ocean contains dissolved gold — approximately 20 million tons — but in concentrations too low to extract profitably.

The Pacific Ocean is larger than all of Earth's landmasses combined.

The ocean contains structures larger than mountain ranges.

The mimic octopus can imitate other sea creatures.

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