Grade 2: Exploring the Layers of the Earth - Hard-Boiled Egg Dissection

According to Mrs. Jackson, “The layers of the earth egg dissection kicks off the second-grade geology unit where we ask the questions ‘What is under our feet?’ and ‘How do rocks and the earth change?’ In this particular lesson, students grapple with the question, ‘Could I dig through the earth?’ The dissection gives the second graders a hands-on way to experience the layers of the earth. They practice how scientists use models to visualize what may be difficult to see or understand and learn how models have limitations.” When asked to explain the steps of the activity, Mrs. Jackson said, “In this dissection, students used a hard-boiled egg to model the layers of the earth. They worked with a partner to crack the shell and peel a thin layer representing the earth's crust. Students noticed that the shell was solid, like the earth's crust, and relatively thin compared to the rest of the egg. It also broke into pieces, just like tectonic plates. The second graders then worked to separate the white from the egg's yolk, representing the earth's mantle and core. They discussed the limitations of this model and pointed out that while the white of the egg is solid, the real mantle of the earth is made of melted rock called magma.” But the lesson doesn’t end here! Following the science experiment, Mrs. Jackson asked the students, "What other objects or food could represent the layers of the earth?" According to Mrs. Jackson, “This part of the activity is where I'm able to see the second graders transfer the idea of models and the layers of the earth to a different scenario. I love when they make connections and go home to share with their families how a peach or avocado is like the earth at the dinner table!” When asked what she loves the most about teaching second-grade science, Mrs. Jackson said, “Second graders are innately curious and joyful scientists. They love sharing their connections to what we are studying, ask great questions, and have so much fun in our classroom!” Way to go, Grade 2 geologists!