<p> Making a Scale Model of the Earth’s Interior</p><p>Information gained from the study of earthquake waves that pass through the Earth’s interior has helped scientists to develop a picture of what it may be like inside the Earth. In this activity, you will make a scale model of the Earth that shows what the inside of the Earth would look like if you could cut it in half and examine the cut surface.</p><p>Step 1. Calculate the thickness of each layer of the Earth and fill in the chart using the following scale:</p><p>1mm on the model equals 70 km inside the Earth.</p><p>A. Divide each layer’s thickness by 70 to get scale model layer thickness and round to the nearest whole number.</p><p>B. Add the scale model layer thickness together to determine circle radius for each progressive layer starting with the inner core.</p><p>Layer of the Earth Layer Thickness Model Layer Circle Radius (mm) Thickness (mm) CRUST 32 km MANTLE 2,900 km OUTER CORE 2,250 km INNER CORE 1,300 km</p><p>Step 2. On the back of this paper, draw the scale model using a compass and ruler. Start in the center of the paper and draw circles based on the circle radius measurements from the chart.</p><p>Step 3. Label each layer’s name and thickness in kilometers.</p><p>Step 4. Answer the following questions.</p><p>1. Many of the deepest earthquakes occur at about 700 km. In which layer do these deep quakes occur?</p><p>2. Which is the thickest layer of the Earth?</p><p>3. Which is the thinnest layer of the Earth?</p><p>4. If you were to use an apple as a scale model of the Earth, which layer would best be represented by the peel?</p><p>5. Which Earth layer would be represented by the seeds?</p>