Make your own tasty sedimentary rock to explore geology! I know kids love rock collecting, and my son is definitely a rock hound with the ever-growing collection! Go ahead and try this rock cycle for kids activity that is sure to please because it’s edible! He just can’t resist adding a new rock from a beachcombing trip to his collection. However, he had a blast exploring types of rocks and the rock cycle with this super easy to make, sedimentary rock bar snack.


Easy edible rock cycle activity for kids to make a sedimentary rock snack bar.

In my experience kids love candy science, my son especially. Nothing says hands-on learning better than edible science! How about an edible rock cycle made out of some favorite ingredients. Pick up the supplies next time you are at the grocery store!

After we finished up the Starburst rock cycle, my son wanted to try out more rock theme STEM activities with food, so here’s a great way to make sedimentary rocks.

ALSO CHECK OUT: Crayon rock cycle


Get ready to add this simple rock cycle activity for kids to your STEM plans, outdoor club, or camp activities. If you want to learn more about the rock cycle, let’s dig in.  While you’re at it, make sure to check out these other fun Edible STEM activities.

Our science activities and experiments are designed with you, the parent or teacher, in mind!  Easy to set up, quick to do, most activities will take only 15 to 30 minutes to complete and are heaps of fun!  Plus, our supplies lists usually contain only free or cheap materials you can source from home!


Learning about the rock cycle with this edible rock cycle! Grab these simple ingredients and combine geology with snack-time.

This candy experiment asks the question:  How does the rock cycle work?

Looking for easy to print activities, and inexpensive science experiments? 

We have you covered…

Click below to get your quick and easy science activities. 


  • 10 oz bag miniature marshmallows
  • 3 tablespoons butter, softened
  • 1 cup of chocolate chips
  • 1 cup M&M’s minis



Let’s get learning with edible science the kids love. Sedimentary rocks are usually layered with different bits represented by the ingredients below. The layers are pressed together but not too tightly.

The layers of sand, mud, and rock or pebbles are compressed over a  long period of time. However, our edible sedimentary rock doesn’t take years to form! Good thing.

STEP 1. Grease an 8×8” baking pan

STEP 2. In a large microwave-safe bowl, heat the marshmallows and butter for 1-2 minutes and stir.

STEP 3. Mix in the Rice Krispies cereal half at a time.

STEP 4. Scoop half your Rice Krispies mixture into the bottom of your greased baking pan and press firmly.

STEP 5. Spread out the chocolate chips and add another layer of Rice Krispies.

STEP 6. Lightly press the Rice Krispies mixture onto the chocolate chips.

STEP 7. Spread the M&M mini’s onto the top layer of Rice Krispies and carefully press them down to stick onto the layer of Rice Krispies.

STEP 8. Let sit for an hour and slice into bars.


Click below to get your quick and easy science activities. 


What are the rock cycle steps, and what are the rock types?

The three main rock types are igneous, metamorphosis, and sedimentary.

Sedimentary Rock

Sedimentary rocks are formed from pre-existing rocks that have been broken down into tiny particles. When these particles settle together and harden, they form sedimentary rocks. They form from deposits that accumulate on the Earth’s surface. Sedimentary rocks often have a layered appearance. Sedimentary rock is the most common rock type found at its surface.

Common sedimentary rocks include sandstone, coal, limestone, and shale.

Metamorphic Rock

Metamorphic rocks started out as some other type of rock, but have been changed from their original form by heat, pressure, or a combination of these factors.

Common metamorphic rocks include marble, granulite, and soapstone.

Igneous Rock

Igneous form from when hot, molten rock crystallizes and solidifies. The melt originates deep within the earth near active plates or hot spots, then rises toward the surface, like magma, or lava. When it cools igneous rock is formed.

There are two types of igneous rock. Intrusive igneous rocks crystallize below Earth’s surface, and the slow cooling that occurs there allows large crystals to form. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals.

Common igneous rocks include basalt, pumice, granite, and obsidian.


Beneath the layers of dirt are layers of rock. Over time these layers of rock can change shape and form.

When rocks heat up so much that they melt, they turn to a hot liquid called lava. But as lava cools down, it turns back to rock. That rock is an igneous rock. Over time, due to weather, and erosion all rocks can break back down into smaller parts.

When those parts settle they form sedimentary rock. This changing of rock forms is called the Rock Cycle.





Discover more fun and easy science & STEM activities right here. Click on the link or on the image below.

Best ever STEM and science activities for kids.


Looking for easy to print activities, and inexpensive science experiments? 

We have you covered…

Click below to get your quick and easy science activities.