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This chapter describes motion in a straight line. It explains position, distance and displacement, average speed, average velocity and acceleration. It also...

This chapter explains how similar cells group together to form tissues, and how tissues form organs and organ systems. It covers plant...

This chapter studies the cell, the basic unit of life. It covers the cell membrane, osmosis and diffusion, the cell wall, and...

This chapter explains what science really is and how secondary science is different from earlier classes. It shows how scientists use models,...

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...