We love this activity, hatching fizzing dinosaur eggs. Such a simple thing to create yet entertains your children for ages. Also made for a beautiful colour mixing activity.
All you need is;
bicarb soda
food colouring
baby dinosaurs (or other animals/items)
white vinegar
plastic wrap (optional)
We have included this activity in our Eggs Unit, learning about oviparous animals (that's animals that hatch from eggs).
Find it here