Some dolphins sleep with one half of their brain at a time.

The deepest part of the ocean is approximately 35,876 feet down.

Fact #2590 · Ocean

The Nile Delta is sinking — it's being weighed down by sediment and eroded by rising seas.

Fact #3913 · Ocean

The Pacific Ocean is the deepest ocean on Earth.

Fact #337 · Ocean

Some whales communicate across vast distances underwater.

Fact #228 · Ocean

Some volcanoes erupt underwater.

Fact #852 · Ocean

A newborn blue whale gains about 200 pounds per day in its first year.

Fact #3662 · Ocean

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

Fact #3399 · Ocean

The Earth's crust is thinner beneath oceans.

Fact #264 · Ocean