1.
Strata and fossils
01.
various strata
02.
The process by which strata are formed
03.
rocks that form strata
04.
Various fossils
05.
The process of fossil creation
06.
What we know from fossils

2.
properties of light
01.
light
02.
Straight path of light
03.
reflection of light
04.
refraction of light
05.
Uses of mirrors and lenses

3.
Dissolution and solution
01.
Changes when various substances are added to water
02.
Changes in a substance when it dissolves in water
03.
Factors affecting the amount of solute that dissolves in water
04.
The concentration of the solution
05.
Examples of using solutions in everyday life

4.
The structure and function of our body
01.
How our body moves
02.
Structure and function of the digestive system
03.
Structure and function of the circulatory system
04.
Structure and function of the respiratory system
05.
Structure and function of the excretory organs
06.
Involvement of multiple organs, diseases related to organs

『O2』 is a science textbook that provides vivid examples of actual experiments and observations.
『O2』 Elementary Science contains all the important content from the new 2022 revised curriculum 5 science textbooks, and provides friendly explanations so that even students can understand the content on their own.
The book is structured so that you can study concepts and problems step by step, and with the practical book, you can perfectly prepare for school exams and build confidence in science.


A vivid science textbook! New textbooks reflect O2 elementary science!

[The core of the 5 textbooks!]
It consists of a neat concept summary that includes all the important contents of the five textbooks that reflect the 2022 revised curriculum, and problems suitable for checking learning outcomes.

[Exploration made easier with experimental videos!]
Begin learning through exploration following the textbook flow, and provide experimental videos with QR codes to make exploration easier to understand.

[Comprised of progress books and practical books!]
Learn concepts with the progress book and prepare for school exams with the practice book.
_Progress book: Learn one concept completely through basic problems (key check ▶ true or false quiz ▶ concept problem) and skill problems, and organize it with unit-ending problems.
_Practical Guide: Unit Assessment Preparation (Unit Summary, Note Test, Unit Assessment, Descriptive Assessment, Performance Assessment) and Academic Achievement Assessment Preparation