This is a cake I designed and assembled for my older son's 5th birthday. It's pretty easy, and not that expensive (about $25-$30; $17 was the cake, so if you're a baker, even less). It requires no specialized scientific knowledge, and is safe (enough for my 5-year-old and his friends; YMMV). Everyone was duly impressed (if I do say so myself, which, in fact, I do), including the 'Mad Science' guy we hired as the entertainment for the party (you can see him check it out in the video- he's the guy in the lab coat behind the birthday boy). It's my first Instructable, so constructive criticism and comments are welcome!
A cake (mine was from Costco, $17); I asked them to write on one half and leave the other half blank. There's no reason that you couldn't bake your own, however.
Candles- traditional in my country (America)
Crisp Rice-Type Cereal, chocolate flavor (technically, I cared more about the color than the flavor).
Marshmallows- probably 2 bags, depending on the size of your volcano
(The previous two ingredients are to make the Rice Krispie Treat recipe that will be used to construct the volcano)
1 small plastic cup (mine was from Ikea ; I chose orange to enhance the lavaesque appearance)
Red or orange frosting
Dry Ice; you only need a little bit, but it sublimates quickly, so get more than you need, particularly if you are buying it on a different day than the party. I got 10 Lbs the day before, and this was probably way too much even with test runs, etc. 5 Lbs should do it. Google "Dry ice (your zip code)" if you're not sure where to get it.
Tongs/Gloves to handle the dry ice , and a hammer to break off chunks would be handy but not necessary.
Butter (for Rice Krispie Treat recipe )
A little water
4 Plastic forks, broken to the height of the cake to support the weight of the volcano
Disposable gloves (for volcano molding)
Cooking spray oil
Dinosaurs- I bought a couple packs at the dollar store.
1 wooden skewer & hot glue gun (for pteranodon support)