Preschool STEM: Volcano

SCIENCE is back this week for Preschool STEM. Today’s volcano experiment is an attention grabber with kids and an excellent example of chemical reactions.

Volcanos: Activity & Conversation Starters

1. Fill a small plastic cup 2/3 full with water (we’re adding math!). Place the cup in a bowl or on a cookie tray to catch the eruption.

2. Add 2 tablespoons of baking soda.

3. Do you want your volcano to erupt with more foam? Add 1 teaspoon of dish soap.

4. Do you want colored lava? Add a small squirt of washable paint.

5. Stir.

6. Pour in vinegar and watch the reaction. What do you observe (see, hear, smell)?

7. Optional: Build a volcano with Legos or Duplos!

What’s Happening?

You’re watching a chemical reaction! When an acid (the vinegar) and a base (the baking soda) mix they form a gas called carbon dioxide.

Share a picture of your volcano experiment! Email us at or share via Facebook. 

Click here for printable instructions! (PDF)