Assignment Summary For this assignment, you will make a scale model—a “core sample”—showing the layers of the Earth: crust, lithosphere, asthenosphere, mantle, outer core, and inner core. Background Information The Earth is composed of six layers with differing thicknesses and properties. The crust forms both land and seafloor. It is thickest under mountains and thinnest under ocean beds. The crust’s thickness ranges from 5 to 70 km thick. The lithosphere consists of the crust plus the upper mantle. It is solid and is about 100 km thick. The asthenosphere is a semisolid layer under the lithosphere. It is about 180 km thick. The lower mantle is 2,250 km thick and is solid, but very hot, rock. The outer core is molten rock and it is 2,266 km thick. Finally, the inner core is 1,210 km thick, and it is solid iron and nickel. Remember that as you go deeper into Earth’s layers, temperature and pressure increase. A core sample is made by drilling into the Earth and pulling out a long cylinder of rock. Geologists analyze these core samples to learn more about Earth’s history and composition. So far, geologists have not yet succeeded in drilling into Earth’s mantle. You will construct a scale model of a core sample. When something is “to scale,” it has a uniform reduction or enlargement. You will calculate how deep each layer should be in centimeters, based on the actual depth of Earth’s layers in kilometers. The percentage of the total for each layer remains the same, but the actual number of units changes. Step 5: Create a typewritten paper describing your model of Earth’s layers. a) Type several paragraphs describing your “core sample” of Earth’s layers in detail. i. Explain what a core sample is. Then, tell whether it is currently possible to take a core sample like the model you’ve created. ii. Compare and contrast the layers in your model, including the significance of the colors. iii. Discuss what it means to create a scale model. iv. Include a table with the values you determined for each layer. v. Discuss the relationships of each layer to the others, including depth. b) Answer the following question in a separate paragraph. i. How does your “core sample” model of Earth’s layers differ from the actual layers of the Earth? c) Make sure your paragraphs include correct sentence structure, punctuation, grammar, and spelling. d) Ask your teacher where you should save your work. Your teacher may also have specific guidelines about the file name you should use.