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YOUR NEXT DISCOVERY

Ocean Explorer: Discover the Blue Planet

Dive into ocean mysteries. Read the clues. Plan your own research expedition.

8 Units32 MissionsAbout 7 hours

Complete the Course to Earn a Certificate and Join the Hall of Fame

A golden research robot explores an underwater ridge beneath a ship. This imagined ocean cutaway is an invitation to explore, not a measured depth diagram.
A shipboard research desk holds a sampling bottle, sensors and an open notebook with a seabed sketch. Ask a question, choose a tool and record the evidence.

A CLOSER LOOK

Below the blue

See the ocean with new eyes. Follow clues, explain surprising changes and plan questions an expedition can answer.

See it. Try it. Make it yours.

  1. Below the blue

  2. The secrets in seawater

  3. Into the deep

Ocean science beginner, roughly ages 9–13; simple-English support. · What to know before you start

Bring with you: Read and compare whole numbers. Add, subtract, multiply and divide small whole numbers. Read short English sentences. No earlier Debsie course or ocean knowledge is needed.

See the ocean with new eyes. Follow clues, explain surprising changes and plan questions an expedition can answer.

A substantial beginner course, roughly ages 9–13, with small steps, visual explanations and frequent practice. Interpret simple ocean evidence and explain choices using connected ideas.

By the end, you can…

  • Read depth information and explain how sound helps map the seabed.
  • Compare salt concentration and density, then explain why water forms layers.
  • Use light, pressure and depth to choose suitable research tools.
  • Distinguish waves from tides and read a simple local tide table.
  • Explain surface currents, deep circulation and nutrient-rich upwelling.
  • Trace food through ocean habitats, including the dark deep sea.
  • Explain several different ocean changes and distinguish their causes.
  • Choose measurements, interpret new evidence and identify what remains unknown.

For another Course

  • Professional navigation, weather forecasts, boating and diving instructions.
  • Advanced fluid equations, chemical equations and logarithmic pH calculations.
  • A complete catalogue of marine species, named ocean currents or world seas.
  • A complete climate-science course or a promise to predict exact local changes.

YOUR LEARNING PATH

One idea leads to the next.

View Course Map →
Unit 1

Below the blue

Read depth information and explain how sound helps map the seabed.

  1. Mission 1 of 32One connected oceanExplain how named oceans and many seas belong to one connected body of water.Up next
  2. Mission 2 of 32How far down?Read a depth scale and convert simple depths between metres and kilometres.Up next
  3. Mission 3 of 32Mountains under the seaIdentify major seafloor shapes and distinguish deep from steep.Up next
  4. Mission 4 of 32Map with an echoUse a sound return time to calculate a simple depth and explain the limits of one reading.Up next
Unit 2

The secrets in seawater

Compare salt concentration and density, then explain why water forms layers.

Unit 3

Into the deep

Use light, pressure and depth to choose suitable research tools.

Unit 4

Waves and tides

Distinguish waves from tides and read a simple local tide table.

Unit 5

An ocean on the move

Explain surface currents, deep circulation and nutrient-rich upwelling.

Unit 6

Life in the blue

Trace food through ocean habitats, including the dark deep sea.

Unit 7

A changing ocean

Explain several different ocean changes and distinguish their causes.

Unit 8

Your research expedition

Choose measurements, interpret new evidence and identify what remains unknown.

A Debsie Course · Ocean science beginner, roughly ages 9–13; simple-English support.