1st Period | The Appearance of the Sea_ How Much Seawater Is There?
Let's take a look at Earth's water... 13
How much seawater is there? ··· 17
Even the sea has a name! ··· 19
Introducing the works of seawater... 22
Spiral Love's Organizing Notes... 26
Find the Science Quiz Master! ··· 27
Mr. Yong's Science Cafe... 28
- What happens to the water that flows into the sea?

2nd Period | Inside the Sea_Ocean, Can You Show Me Your Inside?
How to figure out what's under the sea? ··· 33
Uncover the Undersea Topography! ··· 38
What does the ocean around our country look like? ··· 41
Na Seon-ae's Organizing Notes... 44
Find the Science Quiz Master! ··· 45

3rd Period | Salinity: Why does seawater taste different from river water?
What does seawater taste like? ··· 49
Where does sea salt come from? ··· 51
Is seawater equally salty everywhere?... 53
Na Seon-ae's Organizing Notes... 60
Find the Science Quiz Master! ··· 61
Mr. Yong's Science Cafe... 62
- I'm curious about salt!

4th Period | Ocean Current: Where Did the Message in a Bottle Come From?
The sea water flows and flows... 66
Why do ocean currents flow this way?··· 70
Are all ocean currents the same? ··· 74
Na Seon-ae's Organizing Notes... 78
Find the Science Quiz Master! ··· 79
Mr. Yong's Science Cafe... 80
- What are the currents that flow deep in the ocean?

5th Period | Tide_What is the magic that splits the sea?
Why did the sea part? ··· 85
Why do tides occur? ··· 88
Using the tides like this... 91
Na Seon-ae's Organizing Notes... 94
Find the Science Quiz Master! ··· 95
Mr. Yong's Science Cafe... 96
- What is the secret to victory in the Battle of Myeongnyang?

6th Period | Marine Resources and Pollution: What Gifts Does the Ocean Give Us?
The ocean is so rich in diverse resources! ··· 101
What mysterious treasures are hidden only in the ocean? ··· 103
Protect the Sea! ··· 108
Na Seon-ae's Organizing Notes... 112
Find the Science Quiz Master! ··· 113

Crossword Quiz... 114
Into the Textbook... 116
Search ··· 118
Quiz Answers... 119

『Mr. Yong's Bustling Science Classroom』 Volume 24: The Sea
Can you tell me the secret of the magic that causes the sea water to part and reveal the land?
Earth is the only planet in the solar system with visible water, and is called the water planet.
But how much do we, who live on Earth, truly know about the ocean? The ocean has long been an unknown territory, yet it remains too fascinating to ignore.
Explorers and scientists bravely ventured into the ocean to uncover its secrets, and this effort continues today.
In episode 24 of "Mr. Yong's Bustling Science Classroom - The Sea," we carefully examine the surface and inside of the sea to understand it, and explore the substances contained in the sea and the movement of seawater.
Where is the deepest point in the ocean? What exactly is the Pacific Ocean? What does the ocean around Korea look like, and how was Ulleungdo formed? Why is river water salty, while river water is not? Why does seawater flow in a certain direction, and why do the tides repeat day and night? What future resources can only be obtained from the ocean?
This book provides a detailed overview of everything we can learn about the ocean, from its appearance and interior to the substances in the ocean and the movement of seawater.
We will also scientifically uncover the magic of the sea parting, which we thought was only a legend, and what we must do right now to protect our precious ocean.
Children will learn about the ocean, a place so close to us yet so little known, and realize for themselves how precious it is to us. They will also realize how precious the Earth is, made even more special by the ocean.

If you read it with interest and enjoyment, you will soon find that scientific knowledge has entered your head!
Considering the reading level of children today, who are familiar with visual media but lack basic reading comprehension skills, the content was delivered in the easiest language possible at children's eye level.
The friendly narrative style, consisting of dialogue between characters, makes it easy for even children who are not accustomed to reading short stories.
We've also optimized the structure to make it easy to read and understand accurately by utilizing various visual aids.

Satisfy your curiosity in real life and develop your scientific thinking skills!
It provides a framework for viewing not only simple scientific concepts but also phenomena and problems through a scientific lens.
This book, which draws scientific curiosity from real-life materials and approaches concepts and principles, resonates with children and naturally draws them into the book.
Readers can not only satisfy their scientific curiosity and gain knowledge, but also develop scientific thinking and attitudes.

A colorful visual composition that catches the eye!
It delivers content intuitively through a variety of visual aids, including vivid and realistic photos, clear illustrations, and humorous characters.
Additionally, we've designed the book to reduce the burden of learning and make science an enjoyable subject by summarizing the key content of each unit through 4-panel cartoons.

A new standard for elementary science based on the latest 2021 science textbooks!
It faithfully reflects the contents of the most recently revised elementary and middle school textbooks.
Each volume, organized by topic, covers elementary school subjects as well as concepts learned in middle school, tailored to the elementary school level.
Additionally, we have further enhanced the curriculum connectivity by reflecting the scientific terminology used in the revised textbooks.

A book painstakingly developed by trusted science education experts!
This book was painstakingly created by science education experts who have long studied science at universities and taught children directly in the field, participating in the entire development process from planning to editing.
To convey accurate scientific concepts at an elementary school level, we studied elementary, middle, and high school textbooks as well as various domestic and international expert materials to develop fresh materials and explanation methods that are suitable for children's level.
Additionally, the series' reliability has been enhanced by repeatedly ensuring the accuracy of its content through review by authoritative professors who teach science at education universities.