To begin with
Five Features of This Book
How to use this book

Physics
Question 01 Why do we see streaks of light from a car's headlights?
Question 02 Why can we see ourselves in a mirror?
Question 03 When you put a wooden chopstick in a glass of water, why does it appear to bend at the surface of the water?
Question 04 Why can we see objects larger with a magnifying glass?
Question 05 When firecrackers explode, why is the sound heard only late?
Question 06 Why do I hear an echo?
Question 07 Does sound travel in space?
Problem 08 How much does a 150g apple weigh if measured using a balance scale on the lunar surface where gravity is 1?
Question 09 Gravity acts on all objects, so why can they stand still on the ground?
Question 10 What is the unit of measurement for 'V' written on batteries?
Problem 11 What happens if all the light bulbs are connected in series and one light bulb goes out while all the light bulbs are on?
Question 12 What does the 'W' in '1000W' or '500W' written on microwave ovens, etc. mean?
Question 13 What is the 'cal' in '○○kcal' written on snack bags, etc.?
Question 14 How does solar power generate electricity?
Question 15 Why does lightning occur?

chemistry
Problem 01 If you heat sugar strongly, it will stick to the skin. What happens if you heat salt strongly?
Question 02 Why does the body of the plastic bottle sink in water, but the cap floats?
Question 03 What is the identity of the bubbles that appear when Oxydol is applied to a wound?
Question 04 If you put a sugar cube in a cup of water and leave it for a while without mixing it, which one tastes sweeter, the top or the bottom?
Question 05 What kind of aqueous solution is a 'saturated aqueous solution'?
Question 06 Why does ‘white smoke’ appear around dry ice?
Question 07 What color is the liquid that is formed when the vapor generated by heating red wine is cooled?
Question 08 Why does bread dough rise when you add baking powder to it and heat it?
Question 09 What is an 'atom'?
Question 10 What is the difference between a 'simple element' and a 'compound'?
Question 11 What does the 'chemical equation' represent?
Question 12 Why does copper turn black when heated strongly in air?
Question 13 Why does an old 10-won coin sparkle when you put vinegar on it?
Question 14 How does the mass of a substance change before and after a chemical change?

Earth Science
Question 01 How did Mt. Fuji become so tall?
Question 02 How are the particles visible on the surface of granite, used for tombstones, etc., created?
Question 03 How were the 'lines of fire' at the foot of the mountain and the 'delta' near the river mouth formed?
Question 04 What happens to the sediment that flows from the river into the sea?
Question 05 How are striped strata formed?
Question 06 What can we learn from dinosaur or ammonite fossils?
Question 07 What is the difference between "intensity" and "magnitude," which are commonly used when referring to an earthquake?
Question 08 How are 'earthquake disaster text messages' delivered to us?
Question 09 Why do earthquakes occur frequently in Japan?
Question 10 Why does laundry take longer to dry on humid days?
Question 11 How do clouds form?
Question 12 Why do potato chip bags swell at high altitudes?
Question 13 Why does the wind blow from the sea to the land during the day on a clear day?
Question 14 Why are there days and nights in a day?

creature
Question 01 Why do rapeseed flowers have petals but corn flowers don't?
Question 02 What part of the pine tree does the flower refer to?
Question 03 How do wild vegetables such as bracken and gobi increase their population?
Question 04 Why are insects' bodies covered with hard shells?
Question 05 Where are the squid's intestines located?
Question 06 What is the difference between a newt and a gecko?
Question 07 Why do whales spout seawater near the sea surface?
Question 08 Why do many plants have darker green on the front of their leaves?
Question 09 Why do plants wilt when left in a dark place for a long time?
Question 10 Why does rice taste sweet when you chew it continuously?
Question 11 Why do your ribs rise when you take a deep breath?
Question 12 Why does your heart rate increase during intense exercise?
Question 13 Where in the body are elements and urine each produced?
Question 14 What is the function of the 'Achilles tendon'?

Endnotes
Physics 01 Reflection of Light
Physics 02 Convex Lens (Refraction of Light)
Physics 03 How Sound Transmits
Physics 04 Various forces acting on objects
Physics 05 Ohm's Law

Chemistry 01 Measurement of Density
Chemistry 02 Gas Generation
Chemistry 03 How substances dissolve and solubility
Chemistry 04 Distillation
Chemistry 05 Thermal decomposition of sodium bicarbonate

Earth Science 01 Rock Observation
Earth Science 02 Earthquake
Earth Science 03: Observing Strata ①
Earth Science 04: Observing Strata ②
Earth Science 05 Humidity Measurement

Biology 01 How to Use a Microscope
Biology 02 Flower Structure
Biology 03 Structure of Plant Stems
Biology 04 Transpiration
Biology 05 Photosynthesis Experiment
Biology 06 Needle Experiment

Find more with description

Middle School Science: Asking Questions, Understanding, and Remembering
Finding answers to questions around us

The features of this book are as follows:
First, it provides a fundamental understanding that cannot be achieved through memorization! Recently, more and more questions are being asked to answer questions that ask "why something happened" rather than simply "answering with memorized knowledge."
Even in subjects where you could previously aim for a high score simply by memorizing terminology, students are now required to think for themselves.
This book is designed to be fun to study in a quiz format, covering topics that frequently appear on exams.
You will gain a fundamental understanding that cannot be achieved by simply memorizing the terms.

The second question is easy to imagine because it's based on questions that arise around us! "Why do objects appear larger through a magnifying glass?", "What color is the liquid created by cooling the vapors from red wine?", "Why does rice taste sweeter when chewed?", and other questions based on everyday questions.
So you can easily imagine the situation and understand it better when you know the answer.

A third important point to summarize! While fundamental understanding is crucial, it's also true that some level of memorization is necessary to acquire foundational knowledge.
So, I have organized not only the ‘problems’ and ‘answers’ but also important related information with explanations.
It is filled with pictures and illustrations, and summarizes the important things you must memorize.

Contains key points from experiments and observations that frequently appear on the fourth exam! At the end of the text, we've provided a brief summary of the key points from "experimentation and observation" that frequently appear on exams, covering 10 topics each from physics, chemistry, earth science, and biology.
Because it's easy to get confused about the precautions and operating methods for experiments and observations, let's check out 'In what order should we conduct experiments and observations?', 'What precautions should we take?', and 'What can we learn from the experiments and observations?' on this page.


Includes a "Glossary Index," which can also be used as a fifth glossary! At the very end of the book, you'll find a summary of key terms and their meanings.
Use this book not only when you're curious about the meaning of terms after reading it, but also when you want to quickly review them before an exam.

The four fields of study in middle school science are not independent fields of study, but are deeply interrelated.
The more you study, the more you will be able to understand the relationship.
If you understand the principles behind everyday phenomena that you took for granted, you will become more curious.
Through this book, you will come to realize that the subject of science is a profound and enjoyable one the more you understand it.