Food deserts — areas without access to affordable, nutritious food — correlate strongly with chronic disease rates.

Over 90% of Earth's volcanic activity occurs underwater, along mid-ocean ridges.

The deep ocean remains largely unexplored by humans.

The Portuguese man o' war's tentacles can extend up to 50 meters and remain dangerous even when detached.

The Mediterranean Sea loses more water to evaporation than it gains from rivers, maintained by inflow from the Atlantic.

The Great Barrier Reef has experienced multiple mass bleaching events since 1998 as sea temperatures rise.

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

Certain fish can survive in oxygen-poor water.

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