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Earth Science “Pizza Earth” (or “This Wedgie Rocks!” or “I’d Like an Earth Wedgie, Please.”) Objective: Students will gain an understanding and appreciation for the scale of the Earth’s inner layers by constructing a scale model of a “Pizza Slice” of the Earth’s interior. The students will see the relationship of the Earth’s large-scale structure to the phenomenon of Plate Tectonics. Materials: One big sheet of white paper meter stick string pencil colored pencils, crayons, etc. Procedure: 1. Get the big sheet of paper 2. Fold the paper in half length ways. 3. Draw a l i g h t “center line” the length of the large sheet. Make a dot labeled “Center of the Earth.” 32cm 4. Your scale is 1:20,000,000 (one to twenty million), or 1cm = 200km. The Earth has a radius of about 6371 km. Hence, your “Slice” will be 63.7cm ÷ 2 or 32cm, or one 20 millionth as large as the Earth. 5. Make a mark on the “crust” which is 32cm from the “Center of Earth” mark. See Figure Above. 6. Have a friend hold one end of the string steady at the “Center” mark while you attach your pencil to the string at the 32cm mark. Carefully make an ARC with the string, making sure the string is tight the whole time. This arc represents the outer edge of the Earth’s Crust. 7. Complete the Data Table to determine the length of each layer. Add these marks to your “centerline” and use the same method as step 6 to make an ARC with the string. 1 Calculate the LENGTH IN CM for each layer. Remember that 1cm = 200km EXAMPLE: 6371km ÷ 200 = 32cm Radius (km) Depth (km) Length in CM Layer Boundary Material Average Temperature (°C) air/solid 0 – 870°C 6371 0 Crust Surface 6336 35 Upper Mantle Crust-Mantle boundary solid 1600°C 6221 150 Asthenosphere LithosphereAsthenosphere boundary solid 2200°C 5700 671 Lower Mantle Transition Zone (base of Upper Mantle) solid 3700°C 3486 2885 Outer Core Core - Mantle boundary liquid iron 4300°C 1216 5155 Inner Core Inner Core boundary solid iron 7200°C 0 6371 Center of Earth solid iron 7200°C solid (SiO2) rich The Final Phase: Once you have drawn all of your boundaries, label and color the layers. You choose the colors that you think are representative of the temperatures and compositions. Next, cut around the outside of your “Pizza Earth”. You have created a scale model of the interior of the Earth! (Note: the real Earth is a lot bigger!) Finally, answer the lab questions on that sheet. 2