The Science books for Middle School have been conceptualized keeping in mind the learning abilities of the children while fulfilling the requirement of the ICSE (Indian Certificate of Secondary Education) Board. While writing these books, we have visualized ourselves as the students in a class and have written the content for easy understanding and better recapitulation. We hope that after reading this book, students will have the clarity of concepts and develop a keen interest in the subject. Students will be able to relate to the classroom learning with the environment and the phenomenon in nature. With our years of experience in teaching and book writing, we have written this book to lay a solid foundation for scientific learning for a child. We believe that after reading this book, the child will feel confident about the subject matter.