There are underwater waterfalls caused by differences in water density.

Certain whales use bubble nets to trap fish.

Fact #515 · Ocean

Coral reefs are built by tiny animals called coral polyps.

Fact #654 · Ocean

The Great Barrier Reef is the largest coral reef system in the world.

Fact #13 · Ocean

Some prehistoric marine reptiles hunted in ancient oceans.

Fact #686 · Ocean

There are places in the ocean where pressure is over 1,000 times greater than at sea level.

Fact #2486 · Ocean

The Dead Sea is 10 times saltier than the ocean.

Fact #3396 · Ocean

Some deserts were once oceans.

Fact #2661 · Ocean

The Dead Sea lies at one of the lowest elevations on land.

Fact #50 · Ocean