The leafy sea dragon is so well camouflaged it was not studied alive until the 1990s.

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

Fact #3399 · Ocean

The ocean contains structures larger than mountain ranges.

Fact #2068 · Ocean

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

Fact #3394 · Ocean

Surfer Garrett McNamara rode a 78-foot wave off Nazaré, Portugal, in 2011 — a record at the time.

Fact #4466 · Ocean

Prehistoric oceans had different currents than today.

Fact #740 · Ocean

Phytoplankton populations have declined by about 40% since 1950, threatening the marine food chain.

Fact #5230 · Ocean

Dolphins surf ocean waves purely for fun — one of the clearest signs of play behavior in animals.

Fact #5979 · Ocean

In 1970, a whale carcass was blown up with explosives in Oregon to remove it from a beach.

Fact #793 · Ocean