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Chapter 4 discusses the classification of objects and materials, defining objects as things that can be seen and touched, and materials as substances from which objects are made. It emphasizes the importance of selecting appropriate materials for specific objects based on their properties, such as hardness, solubility, and density. The chapter also differentiates between natural and man-made materials and provides activities to help understand sorting based on these characteristics.
- Author
- v.madavan.sethu
- Language
- EN