I would like the children to watch the following video on a homemade volcano

https://www.nhm.ac.uk/discover/how-to-make-a-volcano.html

Then you can do the following, pick just 1

1. Do the experiment and draw a volcano erupting.
2. Do the experiment and make your own volcano to bring into school.
3. Do the experiment and write about the whole process involved, include facts on magma and lava and the Igneous rock process.

Have fun!