CER: Interpreting the Interior Layers of a Planet Using Seismic Waves

Use the provided graph showing seismic wave velocities (P and S waves) at different depths inside a planet to make a scientific claim about the planet's internal structure. Your response should follow the CER (Claim-Evidence-Reasoning) format. Be sure to answer all parts of the prompt and refer directly to the graph for your evidence.

Answer the following CER prompt using the graph above.

• Make a two-part claim: (1) How many layers does the planet have? (2) What is the state of matter (solid or liquid) for each layer, from the surface to the center?
• Provide two pieces of evidence: (1) Evidence for how many layers there are, and (2) Evidence for the state of matter of each layer. Use specific data from the graph.
• Give reasoning that explains specific wave behavior and how this wave behavior supports your claim.