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This chapter explains why Earth is the only planet known to support life — its position, size, atmosphere and magnetic field. It...

This chapter shows how living and non-living parts of nature are closely connected. It explains habitats, populations, communities and ecosystems, food chains...

This chapter explains why the Moon seems to change shape and how regular sky cycles — day, month and year — gave...

This chapter introduces spherical mirrors — concave and convex — and the images they form. It explains the two laws of reflection...

This chapter explains solutions as uniform mixtures of a solute dissolved in a solvent. It covers saturation, concentration and solubility of solids...

This chapter sorts the matter around us into mixtures and pure substances. It explains uniform and non-uniform mixtures, how passing electricity through...

This chapter shows that all matter is made of a very large number of extremely small particles. It explains how the spacing,...

This chapter defines pressure as force per unit area and shows how liquids and air exert pressure in all directions. It then...

This chapter explains a force as a push or a pull that comes from an interaction between two objects. It covers what...