MAGNETISM  Experiment with iron filings  to see the magnetic field .           Experiment  with iron filings  in water and a magnet .         How do we represent magnetic fields ? What happens when two magnets attract or repel  each other?              The Earth's magnetic field - The magnetosphere     As you can see in the picture, the North Pole (geographical) is actually the South Pole of the Earth's magnetosphere.      ELECTRICITY    Everything in nature is made of atoms , which contains particles called protons  and electrons . Protons have got a positive  electric charge, and electrons have got a negative electric charge. When electrons move from the orbit of one atom to the orbit of another atom, electric current  is produced.             We can classify materials  by how easily they carry or conduct the electric current              Conductors  are materials that conduct electric currents quite easily (cooper, aluminium, silver...