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🌊 All About Oceans

The ocean is the biggest, bluest place on Earth. Dive in to learn why it is salty, where the waves come from, and who lives in the big blue.

3
lessons
~15 min
to learn
🔬 Science
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. The Big Blue OceanUnderstand that the ocean is a huge body of salty water covering most of the Earth, and name the five oceans.The ocean is a huge area of deep, salty water that covers more of the Earth than all the land. Our planet has five oceans: the Pacific, Atlantic, Indian, Southern, and Arctic. The Pacific is the biggest of them all.
  2. Salty Water and WavesLearn that the sea is salty from land and rivers, that wind makes waves, and that tides make the sea rise and fall.Ocean water is salty because rain washes tiny bits of salt from the land into rivers that carry it to the sea. Waves are made by the wind blowing across the water. Twice a day the tide makes the sea rise high and fall low, and the ocean gets deeper the further out you go.
  3. Ocean LifeRecognise the ocean as home to many animals, sort ocean animals from land animals, and learn to protect the sea.The ocean is the largest home for living things, with fish, whales, dolphins, turtles, crabs, and octopuses, plus creatures still to be discovered. Some animals live in the sea and others on land. We can protect the ocean by keeping beaches clean and never leaving rubbish behind.

Questions this course answers

What is an ocean?

An ocean is a huge area of deep, salty water that covers most of the Earth and is full of life.

How many oceans does the Earth have?

The Earth has five oceans: the Pacific, Atlantic, Indian, Southern, and Arctic. The Pacific is the biggest.

What makes the waves in the ocean?

Waves are made by the wind pushing across the top of the water, so windy days make bigger waves.

Why is ocean water salty?

Tiny bits of salt from rocks and land are washed by rain into rivers, which carry the salt all the way to the sea.

Which of these animals lives in the ocean?

Dolphins live and swim in the ocean, while lions, rabbits, and elephants live on the land.

What is one way we can look after the ocean?

Keeping beaches clean and never leaving rubbish behind helps keep the ocean a safe, happy home for sea creatures.

Grounded in trusted sources

  • NOAA
  • National Geographic Kids
  • Smithsonian Ocean
  • Britannica Kids

Every Wunder lesson is built from real, reputable sources — never invented.

Related Science courses

🏖️Coasts and Beaches🌊Salt Water and Fresh Water🐫Animal Adaptations🐫Animal Adaptations and Nutrient Transport🧠Animal Intelligence🐛Animal Life Stages🦴Animal Nutrition and Classification🐠Animals of the Ocean

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