I have made volcanoes before, last year we made a dinosaur small world complete with volcano made with a bottle and sand. This time I wanted something the boys could make themselves and so I dug out the ModRoc that had been sat in my craft cupboard to use. We dug out some old clothes and got to work.
- Small Bottle
- ModRoc (I got mine here)
- Bicarbonate of Soda
- White Vinegar
To make a base I cut up a cardboard box so we had a large square and Alex painted it in a mix of blues and greens all swirled together.
Once the paint was dry we glued a small juice bottle to the base.
Around the bottle we made the volcano shape around it with scrunched up tissue paper and held it in place with sellotape.
Once we were happy with the shape we used ModRoc to cover the tissue paper. We used several layers so it would be nice and sturdy. Then we had to be patient and let the ModRoc dry.
The boys painted the volcano grey and we added some coloured paint oozing down the sides as lava. We left it to dry(again) overnight. I have to admit I was pretty pleased with the finished result!
Of course you can't have a volcano without making it erupt! We did this part outside as it can get a little messy. We added a couple of dinosaur friends into the mix too.
Add two or three spoons of bicarb to the bottle, a little food colouring and then add some vinegar and be ready for the eruption as they react.
The boys absolutely loved this experiment. We talked about vinegar being an acid and when combined with the bicarb it reacts and produces a gas (carbon dioxide). We are already planning our next experiment!
If you like this post, you might also enjoy reading about the time made sparkling fizzy potions.