Materials Needed:

  1. Assortment of Legos
  2. Plastic Cup
  3. Baking Soda, Dish Soap, Water, Vinegar, Food Coloring
  4. Imagination!


  1. Place the plastic cup near the center of the baseplate.
  2. Start building around the plastic cup with LEGO bricks.
  3. Continue building until you form a volcano (it doesn’t have to be perfect!).
  4. Pour 3-4 tablespoons of baking soda, 1 tablespoon of dish soap, and 5 drops of food coloring in the plastic cup.
  5. Add about ¼ cup of water and mix to form a slurry.
  6. Move the volcano outdoors where there is sand, pebble, or dirt. If you can’t go outdoors, then I recommend putting the volcano on a baking sheet to catch all the “lava.”
  7. Slowly pour vinegar into the plastic cup, and then watch the volcano erupt!