| | Introducing the Big, Wide Ocean! | p. 4 |
| | Try This: Find out how much of the Earth's surface is covered with water | p. 7 |
| | What Makes a Fish a Fish? | p. 8 |
| | Try This: See the gases in water that fish need to breathe | p. 11 |
| | Sea Jellies: Animals Formerly Known as Jellyfish | p. 12 |
| | Try This: Defend yourself like a squid | p. 15 |
| | It's a Jungle Down There! | p. 16 |
| | Try This: Test how far away you could smell if you were a shark | p. 17 |
| | Sea Plants | p. 18 |
| | Try This: Eat a meal like a whale | p. 21 |
| | Reef Sweet Reef | p. 22 |
| | Try This: Simulate how sunlight affects coral reefs | p. 23 |
| | The Ocean Holds the Salt! | p. 24 |
| | Try This: Find out how salt gets into the ocean | p. 27 |
| | Amazing Ocean Currents | p. 28 |
| | Try This: Make your own thermohaline current | p. 31 |
| | Tides Come from Outer Space | p. 32 |
| | Try This: Recreate low tide and high tide | p. 35 |
| | Mysteries of the Deep | p. 36 |
| | Try This: See how the Sun affects the ocean | p. 39 |
| | How the Earth Rocks and Rolls | p. 40 |
| | Try This: Make a tsunami in your bathtub | p. 41 |
| | The Ocean and You | p. 42 |
| | Try This: See how divers avoid getting "the bends" | p. 45 |
| | People Affect the Ocean | p. 46 |
| | You Can Make a Difference! | p. 48 |