There are underwater lakes on Earth.

The ocean covers more than 70 percent of Earth's surface.

Fact #657 · Ocean

The deep ocean floor is covered with fine sediment known as ooze.

Fact #1422 · Ocean

A box jellyfish has one of the most potent venoms in the ocean.

Fact #389 · Ocean

Octopuses solve mazes.

Fact #2571 · Ocean

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

Fact #1396 · Ocean

The Mariana Trench reaches depths of nearly 36,000 feet.

Fact #1388 · Ocean

Some coral reefs are visible from space.

Fact #197 · Ocean

Vaccination campaigns have eliminated several diseases in many regions.

Fact #1224 · Ocean