Sea horses swim upright rather than horizontally.

Greenland's ice sheet is melting at accelerating rates, contributing significantly to global sea-level rise.

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

Whale songs can travel thousands of miles through the ocean.

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

Rubber ducks accidentally became global ocean research tools when 29,000 of them spilled into the Pacific in 1992.

Coral reefs cover less than 1% of the ocean floor but support about 25% of all marine species.

Some deep-sea jellyfish emit flashes of light when disturbed.

Coral reefs are formed by tiny marine animals called polyps.