How is the Earth Like an Egg?

earthegg This is a great hands-on lesson for teaching your students about the layers of the earth and for older students you can even teach about the plates and how they move.


  • To identify and label the layers of the earth by using an everyday object as a model.

Before You Start: Boil an egg for each student or pair. Create a question sheet for students to answer as they complete the activity.

Let's Get Started! Step 1. Give each student an egg and a butter knife. Discuss what the egg is and ask students if they have any ideas about how the egg is like the earth before they start.

Step 2. Have each student gently tap the shell of the egg and crack it in several places. If you have studied the earth's crust your students should be able to tell you that this is like the crust of the earth and that a cracked shell is a better model of the earth than a smooth shell because the cracks are like the plates.

Step 3. Next, have students cut straight through the shell cutting the egg in half.

Step 4. Ask the students to talk about what they see. What part of the earth is the white part like? What part is the yolk like?

Step 5. In the end I had my students finish answering these questions on the paper I gave them. Finally, they got to eat their egg.

Furthermore: For older, more advanced students you could finish the crust activities by moving and pushing the "plates" and talking about how fault-block, dome-shaped, and other types of mountains are formed.

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