Graham Cracker Plate Tectonics

Sep 9, 2015

This quick and tasty kids’ science activity gives little scientists a hands on way to explore plate tectonics – the movement of the Earth’s crust that leads to the formation of volcanoes, mountains, and oceanic trenches. It’s the perfect combination to our action packed Landform Activity Pack!

This is brilliant! Teach kids about plate tectonics with graham crackers!

Getting Ready

Our summer travels led us to several volcanoes so naturally my kiddos were curious how they were formed.

For this activity, I grabbed a box of graham crackers, some Cool Whip, and a plate. We were ready to make mountains.

{If you don’t have Cool Whip on hand you could use any soft food like frosting or peanut butter to mimic the Earth’s hot flowing mantle.}

Explaining Plate Tectonics

My kiddos and I looked through several geology books explaining the layers of the Earth. To simplify, I explained that the Earth was a made up of many layers.

The outermost layer is hard and surrounds the Earth like a shell, this is called the crust. Earth’s crust is cracked into big pieces called tectonic plates.  These plates fit together like a puzzle surrounding the Earth.

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Under these plates is a layer called the mantle.  The mantle can flow like a liquid if it’s hot enough and has enough pressure.

This causes the big plates of crust to move and its the moving of these plates that causes mountains and volcanoes to form.

Making Plate Tectonics

Once my kids had an idea of how tectonic plates move, it was time to get our hands messy.

I handed each of my kids a dish with solid but moveable Cool Whip mantle.  I added a few drops of red and orange food coloring to make it match the fiery orange mantle in our books.

On top of the mantle we placed two graham crackers to represent the cooler, rigid crust.

Where the two graham cracker plates meet is called a plate boundary and they are named by the way the plates move against each other.  I also made a dish for myself so I could model what each boundary should look like for my kids.

Graham Cracker Plate Tectonics. This is brilliant!

A Transform Boundary

The first boundary we recreated was a transform boundary. This type of boundary occurs when two plates grind past each other.

I had the kids gently push their crackers together then slowly slide one up and the other down.  I asked them to pay close attention to how it felt to slide their plates against each other.

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“It’s scratchy,” exclaimed my 3 year old.

I had them repeat the sliding in the opposite direction and listen.  You could hear the plates grind past each other.

At transform boundaries, plates move in opposite directions slowly grinding past each other, occasionally getting snagged on each other. As pressure builds, the plates finally slip, releasing a jolt of energy that we feel as an earthquake. California’s San Andrea’s fault is a perfect example of a transform boundary.

Divergent Boundaries

Divergent boundaries occur when two plates move away from each other.

To mimic this, I had my kids gently press down on each graham cracker plate while pulling them apart.

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“What happened?” I asked.

“Some of the mantle oozed up,” replied my 5 year old.

Most active divergent boundaries occur where two oceanic plates move away from each other. Hot magma flows up where the plates separate, forming large underwater lava flows and creating new seafloor and even volcanic islands.

Convergent Boundaries

Convergent boundaries are the final type of boundary and they occur when two plates move toward each other.  When two plates move toward each other they can either collide forming mountains or one plate can slide under the other at the subduction zone.

To model when two continental plates collide to form mountains, I quickly dipped one end of each graham cracker in water.

I placed them with soggy sides facing each other then had my kids gently push the two plates together.

The soft graham crackers slowly folded up on each and mountains were formed.

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This is how the Himalayas were formed.

Subduction Zone

Finally we used our last graham crackers to make a subduction zone – what happens when a more dense oceanic  plate is thrust under a less dense continental plate.

My 5 year old instantly recognized this boundary as it’s what led to the formation of all the volcanic mountains that surround us: the Cascade Range.

To mimic what occurred in the Pacific Northwest of the United States, I had the kids gently press one graham cracker down under the other.

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“Where are the volcanoes,” asked A.

To recreate her beloved Cascade Range, I poked several holes in the less dense continental ridge parallel to the subduction zone.  As my daughter slid the oceanic plate under the continental plate, the oceanic plate melted and hot magma oozed up through the fissures creating a range of volcanic mountains.

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Finally, after all that earth shaking mountain making, the kiddos were ready to dig in.  Oh, science sure is sweet!

This is brilliant! Graham cracker plate tectonics.

For Older Children

Since my kids are a little young, I simplified the layers of the Earth involved in plate tectonics to crust and mantle.  Technically, it is the Earth’s lithosphere that is broken up into tectonic plates.  The lithosphere is made up of the outer most layer of the Earth, called the crust and the solid, top most layer of the mantle.  The lithosphere’s plates float on layer of the mantle called the asthenosphere.

The asthenosphere is hotter than the lithosphere and while generally is a solid can be fluid-like if at a hot enough and under enough pressure.

Find More

Dive deeper into Earth science by grabbing our action packed Landform Activity Pack!

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14 Comments

  1. Claire

    Hi! Quick question, I’m hoping to do this with my 4th graders next week, but I am teaching 3 sections of 25+ students!

    Do I need to get enough graham crackers for a different plate/set-up for EACH different plate movement demonstration? Or can I use the same Cool Whip & Crackers for each if I do the water one last?

    Just looking for the cheapest route! 🙂
    Thanks!

    Reply
    • Ashley

      Hi Claire,
      Great question!
      You will definitely want to have enough graham crackers and plates for each student or student pair, but you should be able to “re-use” the graham crackers and plates for the different plate movement demonstrations if you do the water one last.
      Hope that helps!
      Warmly,
      Ashley // Happiness Ambassador

      Reply

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