In this fun and easy excavation activity for kids, we’re going to use a chemical reaction excavation that fizzes, bubbles, and pops to uncover our treasures we have hidden inside.
  • 2 ounces of lemon juice
  • 1 teaspoon of baking soda
  • One square of toilet tissue
  • Tape
  • Ziplock sandwich baggie
  • Small items to "excavate" that can fit in the square of tissue. I like to use small tumbled stones. Little plastic aliens, dinosaurs, or other toys are also fun. 
  • Water


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  1. Put the baking soda in the toilet paper square.
  2. Add the small item to discover in the baking soda.
  3. Fold the paper around the baking soda and tape it closed.
  4. Pour the two ounces of lemon juice into the baggie.
  5. Now carefully fill the baggie about a quarter of the way full with water.
  6. Head outside to an area that can get messy.
  7. Drop the packet of baking soda into the baggie.
  8. Quickly seal the baggie securely closed. 
  9. Stand back and wait for your chemical reaction excavation to pop and reveal the hidden item.


I hope you enjoyed this super quick tutorial and had fun creating your own Chemical Reaction Excavation to investigate and explore. These excavations are very easy to make and a lot of fun!
Pro tip: Use this activity to create some excitement around discussions or lessons about acids and bases, chemical reactions, kitchen science experiments and more!
If you love rocks, geology, and excavating as much as we do, be sure to check out our Excavating Adventures monthly subscription by clicking the link below and get an awesome new excavation delivered each month loaded with rocks, minerals, gemstones, fossils, and more!
Happy Excavating!
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