Volcano Science Project

how to make a volcano
Volcano image e1626709505231

Want to know how to make a volcano with your kids? Making a volcano that erupts is one of those good old classic science projects that kids just love doing!

We made our volcano model with salt dough. Salt dough is super simple to make and can be air dried if you want to make it ahead and save it for a science fair project.


  • 2 cups of Salt
  • 6 cups of Flour
  • 2 cups of Water
  • 2 Tbsp of Cooking Oil
  • Coloring (you can use food coloring or liquid water color)

Mix the best you can with a spoon, but you may need to just dig in with your hands. That’s what I had to do. This is a hard dough so you can mold it and make it stand up around the bottle for your volcano filling. You may need to add a little bit more water depending on your climate. I added 1/4-1/3 cup more after I got into it.

You may notice the gray swirls in our dough. We tried to color our dough with some black liquid watercolors, but it would have taken the whole bottle, so we gave up!

Salt Dough
building the volcano
volcano made

You will need a bottle in the center. You can use a soda bottle a water bottle or a glass bottle like we used. Whatever you have on hand that has a smaller opening on top should work just fine!

Place the bottle in the center of a large cookie sheet. Mold the salt dough into a volcano shape around the bottle making sure to leave an opening at the top to add your volcano’s “lava” filling.

This is tons of fun to shape it to look like an amazing volcano.


Now to make the eruption solution! Making the volcano erupt is fun, messy and is over pretty quick, so don’t blink!


  • Warm Water
  • Red Food Coloring- Or red liquid watercolors
  • A few drops of Dish Soap- about a Tablespoon
  • 2 Tbsp Baking Soda
  • Vinegar
ingredients to make your volcano erupt

Mix the red coloring, water, and some dish soap together. We used about 2 cups of water, but you’ll just need to fill your bottle about 3/4 of the way full.

baking soda and vinegar volcano

Put 2 Tablespoon of baking soda into the bottle.

Pour in your vinegar and watch the eruption go! Now is the perfect time to teach about the chemical reaction between the baking soda and vinegar.

erupting volcano