1.
Use of electricity
1 Conditions for the light bulb to turn on
2. Compare the brightness of light bulbs according to the connection method.
3 Electrical Safety and Energy Saving
4 Properties and Uses of Electromagnets
● Unit summary, unit final problems

2.
Change of seasons
1 Relationship between solar altitude, shadow length, and temperature during a day
2 Seasonal changes in the sun's altitude, length of day and night, and temperature
3. Why temperature varies depending on the sun's altitude
Why do the four seasons change?
● Unit summary, unit final problems

3.
Combustion and digestion
1. A phenomenon that occurs when a substance is burned
2 Things needed when burning a substance⑴
3 Things needed when burning substances⑵
4. Substances produced after combustion
5 Different Ways to Put Out Fire
6 Fire Safety Measures
● Unit summary, unit final problems

4.
The structure and function of our body
1 Why we can move our bodies
2 The process of food digestion
3 What Happens in Our Body When We Breathe
4 Blood moving through our body
5 Ways to Eliminate Waste Products from Our Bodies
6 The process by which stimuli are transmitted and responded to in our body
7 Changes that occur in our bodies when we exercise
● Unit summary, unit final problems

1.
Energy and Life
1 Why energy is needed and what forms it exists in
2 Energy that changes into different forms
3. How to use energy efficiently
● Unit summary, unit final problems

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

[The core of the 9 textbooks!]
It consists of a neat concept summary that contains all the important contents of the 9 types of textbooks and problems suitable for checking learning results.

[Exploration made easier with experimental videos!]
Begin your learning with an exploration following the textbook flow, and provide QR code experiment videos to make it easier to understand the exploration.

[Consisting of progress books and assessment books!]
Learn concepts using the progress book and prepare for school unit evaluations and academic achievement assessments using the assessment book.
_Progress book: Completely learn one concept through basic problems (key check ▶ step 1 ▶ step 2) and skill problems, and summarize with unit-ending problems.
_Evaluation book: Unit assessment preparation (unit summary, note test, descriptive note test, unit evaluation, descriptive evaluation) + Academic achievement evaluation preparation

[Includes questions for the Academic Achievement Test!]
_1 question for the Academic Achievement Assessment (Unit 1-2)
_2 questions for the Academic Achievement Test (Units 3-5)