Question

earthquake waves move at different speeds in different materials. therefore we can determine the composition of what part of earth using earthquake waves? earths layers earths atmosphere

Explanation:

Earthquake waves (seismic waves) travel through Earth's interior. Different materials (like those in Earth's layers - crust, mantle, core) affect wave speed. By studying wave behavior (speed, reflection, refraction), we can infer Earth's layer composition. Earth's atmosphere is gaseous and not the main focus for earthquake - wave - based composition determination as seismic waves mainly interact with solid/liquid Earth materials (layers).

Answer:

Earth's Layers