Home > School Kids Activities and Crafts > Edible Metamorphic Rock Activity
ByTrisha StanleyPublished on
Our edible metamorphic rock activity is a fun way to learn about how metamorphic rocks form.Metamorphic rocks are one of three types of rocks along withsedimentary rocksand igneous rocks.
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (1) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (1)](https://i0.wp.com/rainydaymum.co.uk/wp-content/uploads/2017/11/rock-fudge-pin.jpg)
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Metamorphic rocks form when existing rocks (either sedimentary, igneous, or metamorphic) are exposed to high heat, high pressure, and/or hot mineral-rich fluids. It’s this heat and pressure that push and squish and change the rock into a new type of rock. There are different types of metamorphic rocks based on what type of rock it started as. Have you ever heard of marble? It’s just one type of metamorphic rock. Purchase a set of metamorphicrockslike the one below to help study the different types. Metamorphic rocks are difficult to find just out and about since they usually form deep within the earth’s crust or near tectonic plate boundaries (where lots of heat and pressure exist).
Learn more about Rocks and Fossils with our Activities for Earth Science.
Edible Metamorphic Rock Activity – Make Slow Cooker Cranberry Walnut Fudge
This simple slower cooker fudge recipe is an easy way to show how metamorphic rocks form. We start with chocolate chips and pieces of chocolate. This represents sedimentary rock layers. Adding cranberries and walnuts represents the fossils that were once part of a sedimentary rock. Sometimes fossils can be found in metamorphic rock but often they are squashed and unrecognizable – kind of like when we cut into the fudge.
The heat from the slow cooker and stirring represent the heat and pressure changes that occur to make metamorphic rock. Our end product – the fudge – doesn’t look like the beginning chocolate pieces.
This is a version of our original slow cooker fudge recipe.
- 500 g of chocolate chips or chocolate pieces – we used a combination of dark chocolate, milk chocolate, and white chocolate
- 1 tablespoon of unsalted butter
- 1 teaspoon of vanilla extract
- 1 can sweetened condensed milk (397 g)
Try these Layers of the Earth Sugar Cookies for more Edible Science Models that you can make with kids.
Instructions for Making Slow Cooker Cranberry Walnut Fudge
Add the chocolate, butter, vanilla extract, and sweetened condensed milk to your slow cooker.
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (3) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (3)](https://i0.wp.com/rainydaymum.co.uk/wp-content/uploads/2017/11/rock-fudge3.jpg)
Add in the cranberries and walnuts.
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (4) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (4)](https://i0.wp.com/rainydaymum.co.uk/wp-content/uploads/2017/11/rock-fudge2.jpg)
Heat on low for 2 hours stirring every 15 minutes. Line a square baking dish with parchment paper. Pour melted fudge into the lined baking dish. Refrigerate until set. Cut in cubes. Store in a sealed container in the refrigerator.
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (5) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (5)](https://i0.wp.com/rainydaymum.co.uk/wp-content/uploads/2017/11/rock-fudge1.jpg)
This is such an easy fudge recipe that kids can help add all of the ingredients to the slow cooker. It’s a bit difficult for them to stir, so that’s probably a job for an adult.
Slow Cooker Walnut and Cranberry Fudge Recipe
Cerys Parker
Edible science experiment to make Slow Cooker Walnut and Cranberry Fudge as an example of Metamorphic Rocks
4.34 from 3 votes
Print Recipe Pin Recipe
Course Dessert
Ingredients
- 500 g of chocolate chips or chocolate pieces milk chocolate, and white chocolate
- 1 tablespoon unsalted butter
- 1 teaspoon vanilla extract
- 1 can sweetened condensed milk
Instructions
Add the chocolate, butter, vanilla extract, and sweetened condensed milk to your slow cooker.
Add in the cranberries and walnuts.
Heat on low for 2 hours stirring every 15 minutes.
Line a square baking dish with parchment paper.
Pour melted fudge into the lined baking dish.
Refrigerate until set.
Cut in cubes.
Store in a sealed container in the refrigerator.
Tried this recipe?Let us know how it was!
This is our favourite slow cooker – it’s large enough to contain LOTS of fudge and useful for batch cooking meals for the family as well.
So that your food doesn’t always have a lingering flavour of the last thing cooked we recommend using Slow Cooker Liners in all of your uses for the slow cooker. They will make it easier to clean too which is always a bonus.
I use a Square Cake pan when making fudge either a silicone 8inch pan or one with a removable bottom always lined with parchment paper to avoid the fudge sticking whilst it cools.
Looking for recommendations of Reading Material on Rocks then check out or Rocks, Fossils, and Earth Science Book Recommendations for Kids.
Learning about Rocks
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (8) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (8)](https://i0.wp.com/diaezg2hoh8my.cloudfront.net/wp-content/uploads/2014/11/Volcanoes-Discovery-Box-realistic-e1489265132268.jpg)
Let your child become a Volcanologist with a Green Kids Craft Volcano Science set – with 7 different science and creative activities included this would be great to use as part of a study on Earth Science and rocks.
Become a real geologist as you and your child test and learn about rocks and minerals with this hands-on learning science kits. Containing 30 different samples and full instructions you’ll soon learn what you need to do and can then use this skills on other rocks and minerals that you find.
Add to your Non-fiction book collection with these 3 favourite books to support learning, encourage investigation and extend your and their knowledge. The first is a field guide from the National Geographic Book Range on Rocks and Minerals, with this guide it aims to get kids out, exploring and discovering more about the rocks around them. The second – a Geology Lab for Kids has 52 different science activities and experiments for kids perfect for encouraging your child to get hands-on learning about Earth Science. The last is a reference book covering rocks and minerals which will help you answer all of the inevitable questions that kids and you may have as you turn your hand to learning and exploring about rock science and geology.
More Edible Rock Activities for Kids
- Makeedible sedimentary rocksto learn about how sedimentary rocks form.
- Makeedible igneous rocksto learn about how igneous rocks form.
- Use candy to make an edible rock cycle.
- How about making an edible model of how mountains are made
Pin This Edible Science Activity to do Later
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (9) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (9)](https://i0.wp.com/rainydaymum.co.uk/wp-content/uploads/2017/11/Edible-Science-Slow-Cooker-Fudge2.jpg)
![Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (10) Edible Metamorphic Rock - Slow Cooker Cranberry Walnut Fudge (10)](https://i0.wp.com/rainydaymum.co.uk/wp-content/uploads/2017/11/edible-metamorphicrocksquare.jpg)
Author
Trisha Stanley
Trisha is an educator with a passion for science literacy and mom to Aiden, Lily, and Elon.
She’s the creator of Inspiration Laboratories, a blog dedicated to encouraging learning through creativity and play.