Adventures in Wonderlab

Adventures in Wonderlab

Fun science adventures for all ages!

Dinosaur Science: Erupting Dinosaur Eggs!

Dinosaur Skeleton Matching

After our skeletons/bones/fossil experiments right before Halloween, I thought it was a perfect time to bring out my supply of dinosaur toys! My son was a huge dinosaur collector when he was in preschool, so we have accumulated a lot of great dinosaur toys over the years. For one of the preschool science “stations”, I placed 11 plastic dinosaurs, and their matching skeletons. The preschoolers matched each dinosaur toy to its skeleton.



All matched up!

Dinosaur Teeth: Herbivore or Carnivore?

Looking more in depth with dinosaur fossils, this week we discussed dinosaur teeth. Carnivores, or meat-eaters, had different shaped teeth than herbivores, or plant-eaters. I used my salt dough recipe (this time using whole wheat flour) to make an example of a sharp meat-eater’s tooth fossil. We compared this sharp tooth to our own canines and how we can use our front teeth to rip into meat (such as a chicken wing). I also made a salt dough herbivore tooth fossil. It is a much flatter tooth used for mashing and grinding. Imagine eating a carrot, and how you use the flat molars in the back of your mouth to grind up the carrot.


Rawr! Dinosaur tooth fossils!

Dinosaur Eggs 3 Ways

I made dinosaur eggs three different ways this week. Two types of “erupting” dinosaur eggs, and one frozen type of egg – all had baby dinosaurs inside ready to hatch!

Frozen Eggs

The frozen dinosaur eggs are the easiest to assemble, and lots of fun to hatch! Simply stretch out the opening of a balloon, and put a small plastic dinosaur into the balloon. *Tip: once you can manage the dinosaur half-way in, blow up the balloon, and the dinosaur will have more room to fall right in.* After the dinosaur baby is inside the balloon, fill the balloon with water, tie it, and put it in the freezer overnight.

The following day, we used my favorite pipettes to slowly melt away the frozen ice with drops of water, and hatch the baby dinosaurs. It was a beautiful sunny day, so we also used the power of the sun to help melt away the ice.


Erupting (Bath Bomb) Dinosaur Eggs with Citric Acid

I used “bath bomb” ingredients to make these erupting eggs. After mixing together the bath bomb ingredients, I placed a plastic dinosaur in the center of each egg. The bath bombs dry overnight, and harden into a solid egg. The next day, drop the dinosaur egg in a bowl of water and watch it erupt! The science behind bath bombs is a simple acid/base reaction. Citric acid is a weak acid, and baking soda is a weak base. When mixed together with water as a catalyst, carbon dioxide (the fizzy bubbles) are produced.

Citric acid Erupting Egg Ingredients:

Mix 1 cup baking soda and 4/5 drops food coloring + 1 tsp. water with a whisk

Add 1/4 cup citric acid, and stir with a whisk

Add 1 TB olive oil at a time until mixture is crumbly and will hold together (usually 4 TB)

Form into eggs with dinosaur baby in the center, and let harden overnight



Wear gloves if you have sensitive skin or any small cuts


Chemical reactions are the best!

Erupting (Bath Bomb) Dinosaur Eggs with Crystal Light

Citric acid is much more difficult to find than I expected. Both my local Meijer and Walmart do carry citric acid, but only in small bottles (for canning), and they were both sold out! I found the best value for citric acid at Amazon. In the meantime, I found another bath bomb recipe that uses Crystal Light in lieu of citric acid.

I will be honest- I did not expect these erupting eggs to be successful. Much to my surprise, the Crystal Light created a very fizzy and fast reaction (in this case, the Crystal light is the acid instead of citric acid). I really did not need to add the epsom salts (since these bath bombs were used to erupt dinosaur eggs and not for a relaxing bath), but I read that the epsom salt helps prevent the Crystal Light and baking soda from reacting before the bath bomb is placed in water.

Crystal Light Erupting Egg Ingredients:

Whisk together 1 cup baking soda, 1/2 cup Crystal Light, and 1/2 cup Epsom Salt

Add 4-5 drops food coloring

Spray with water until mixture is crumbly and will hold together

(I deviated from the directions here, and added 2-3 TB of olive oil to get the mixture to hold together)

Form into eggs with dinosaur baby in the center, and let harden overnight



Who knew Crystal Light could be so much fun?


The baby dinosaur fizzed right out of its erupting egg


3 dinosaur eggs ready to hatch

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