1.
Objects and substances

Day 1: Properties of the substances that make up objects
Day 2 Classification of objects by type of material
Day 3: Various States of Matter (1)
Day 4: Various States of Matter (2)
Day 5 Objects using the properties of matter
Day 6: Organizing your thoughts into a network and evaluating each unit

2.
Earth and Sea

Day 7: Gas surrounding the Earth
Day 8: Appearance of the Earth's surface
Day 9: Land and Sea Water
Terrain visible from the beach on the 10th day
Day 11: High and Low Tides
Day 12: The Value and Conservation of Tidal Flats
Day 13: Organizing Your Thoughts into a Network and Evaluating Units

3.
nature of sound

Day 14: Characteristics of objects that make sounds
Day 15: Loud and Soft Sounds
Day 16: High and low sounds
Day 17: Transmission of Sound
Day 18: How to Reduce Noise
Day 19: Organizing Your Thoughts into a Network and Evaluating Units

4.
Infectious Diseases and Healthy Living

Day 20: Cases and Risks of Infectious Diseases in Daily Life
Day 21: Various infection processes and lifestyle habits
Day 22: A Society Safe from Infectious Diseases
Day 23: Infectious Disease Prevention Guidelines
Day 24: Organizing Your Thoughts into a Network and Evaluating Units

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

[The core of the 7 textbooks!]
It consists of a neat concept summary that includes all the important content of the seven textbooks that reflect the 2022 revised curriculum, and problems suitable for checking learning outcomes.

[Explore more easily with experiments and helpful videos!]
Begin your learning with exploration following the textbook flow, and provide experiment videos and helpful videos via QR codes to make exploration easier to understand.

[6 pages a day, complete your science studies in 24 days!]
Complete everything from concepts to problems in one day with a 6-page daily schedule.

[Comprised of progress books and practical books!]
Learn concepts with the progress book and prepare for school exams with the practice book.
Progress: Step-by-step learning (start with exploration → understand the concept → complete with problems → conclude the unit_organize into a network of thoughts, evaluate the unit)
_Practice Book: Unit Assessment Preparation (Unit Summary, Note Test, Unit Assessment, Descriptive Assessment, Performance Assessment)

『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 7 science textbooks, and provides friendly explanations so that even students can understand the content on their own.
The book is structured in stages 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.