The ocean is a huge body of salty water. It covers most of Earth.
There is one big world ocean. It has five named parts. The Pacific is the biggest ocean.
Salt in the ocean mostly comes from rocks on land. Rain and rivers carry it to the sea.
The ocean water rises and falls. It does this along the shore. This is called the tide. The pull of the moon helps make the tides.
A tsunami is a set of giant waves. An earthquake under the sea most often makes them.
The deepest place in the ocean is called the Challenger Deep. Deep down in the ocean it is dark. Many deep-sea animals make their own light.
Coral reefs are built by tiny animals. They are called polyps. Plankton are tiny living things. They drift in the ocean.
The blue whale lives in the ocean. It is the biggest animal that has ever lived.
Blue whales eat krill. Krill are tiny sea animals. Blue whales can grow to be about 100 feet long.
Words to know
- tsunami: giant waves
- polyps: tiny animals
- krill: tiny sea animals
