Bake cake and allow it to cool completely.
While the cake is cooling, make chocolate frosting.
Once the cakes cool, fill and frost the entire cake. Use a spatula to create a rustic design. It does not have to be smooth.
Decorate the sides of the cake with roughly chopped Oreos, Oreo crumbs, Snickers candies. Don't use them all up. Save some for a later step.
Keep cake aside while you work on the volcano.
Make a batch of rice krispie treats. Be sure to mix in some cocoa powder and brown food coloring.
Before the mixture starts to set, quickly dump the mixture onto a sheet of wax paper.
Place a narrow plastic cup in the center.
Oil your hands and mold the mixture into a volcano shape around the plastic cup.
Pour melted red and orange chocolate around the top edges and let it pour down along the sides. Try not to have any chocolate go inside the cup.
Let this volcano set and firm up for about 1 hour at room temperature.
Remove it from the wax paper gently and place it on the prepared cake.
Decorate with remaining Oreos, candy bars and dinosaur toys around it.
To create smoke effect with dry ice, place a few small cubes or 1-2 tablespoons of dry ice carefully into the plastic cup of the volcano followed by a small amount of hot water. That should result in smoke for a few minutes. Enjoy!