How to Make a Lava Lamp

  1. Get a plastic, 500ml water bottle.
  2. Tear off the label.
  3. Fill the bottle one third with water.
  4. Then fill the bottle almost to the top with oil.
  5. Put in some food colouring.
  6. Break up and put in an alka seltzer tablet.
  7. Shake the bottle.
  8. The bubbles rise to the top of the bottle.