An octopus has three hearts, blue blood, and nine brains — one central brain and one in each arm.

There are underwater waterfalls caused by differences in water density.

Fact #2442 · Ocean

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

Fact #3399 · Ocean

Some dolphins cooperate to herd fish while hunting.

Fact #1273 · Ocean

The Ring of Fire surrounds much of the Pacific Ocean.

Fact #814 · Ocean

The Dead Sea is 10 times saltier than the ocean.

Fact #3396 · Ocean

A googol is the number 1 followed by 100 zeros — the search engine Google is named after it, misspelled.

Fact #3598 · Ocean

Whales are mammals and must breathe air.

Fact #265 · Ocean

Octopuses can open jars to access food inside.

Fact #1298 · Ocean