Ⅰ.
Interaction between the atmosphere and the ocean

1.
Properties and circulation of sea water
Lesson 1: Properties of Seawater
Lecture 2: Ocean Circulation
2.
Weather changes and bad weather
Lesson 3: Atmospheric Pressure and Weather Changes
Lecture 4: Typhoons and Major Weather Conditions
3.
Interaction between the atmosphere and the ocean
Lecture 5: El Niño and the Southern Oscillation
Lecture 6: Climate Change on Earth

Ⅱ.
Earth's history and the rocks of the Korean Peninsula

1.
History of the Earth
Lecture 7: Age of Strata and Rocks
Lecture 8: Sedimentary Rocks and Sedimentary Environments
Lecture 9: Life and Environment in the Geological Era
2.
Rocks of the Korean Peninsula
Lecture 10: Magma and Igneous Rocks
Lecture 11: Metamorphism and Metamorphic Rocks
Lecture 12: National Geoparks

Ⅲ.
The evolution of solar system bodies, stars, and the universe

1.
Solar system bodies and stars
Lecture 13: The Movement of Celestial Bodies in the Solar System
Lecture 14: Physical Quantities of Stars
Lesson 15: HR and the Evolution of Stars
2.
Galaxy and Universe
Round of 16_External Galaxies
Lecture 17: The Hubble-Lemaître Law and the Expansion of the Universe
Lecture 18: Establishing Modern Cosmology

[Exam Preparation]
- Check your skills by grade level

[Special Edition] Correct Answers and Substantial Solutions

[Concept Learning]

· Understand essential core concepts from textbooks
- The core content of the textbook is organized in an easy-to-understand manner using various pictures and materials.
- We have organized the material pick and exploration pick corners to select important materials and explorations for focused learning.
- Detailed corrections and supplementary explanations are included at appropriate places to help with understanding the concepts.
- Difficult terms are presented with Chinese characters or English explanations to make them easy to understand.

· Explore textbooks and analyze materials
- We have selected important research topics and presented them in the form of process, results, and summary along with photographic materials, and have created confirmation questions to check whether the research activities have been understood.

· Basic solid problem
- It consists of fill-in-the-blank questions, short answer questions, true or false questions, and line connection questions by topic for concept organization.
- It is composed of various types of easy problems so that you can quickly check your level of understanding of the concept.

· Problems that improve your skills
- We have compiled a variety of practical problems to help you review important concepts.

- We have created a separate set of descriptive questions to help you prepare for school descriptive exams.

· Intermediate level practice problems
- We have composed descriptive questions along with various practical problems that allow you to review important concepts for each unit.

· Summary of key points of the final chapter
- We have summarized the key contents of each chapter so that you can quickly check them.

- It is structured so that you can organize important concepts by writing them down yourself.

· Unit evaluation questions
- At the end of each unit, we have organized assessment problems that allow you to check the concepts you must know through questions, along with descriptive questions.

[Exam Preparation]

· Check your skills
- To help you prepare for school exams, we have provided expected school exam questions by difficulty level and structured them into descriptive questions.
- You can prepare for the actual exam by using images in the same format as the actual exam paper.

[ Correct answer / Substantial explanation ]

- We provide detailed and friendly explanations that are easy to understand.
- Includes avoiding incorrect answers, adding concepts, analyzing data, etc.