Density - Amount of matter in an amount of space, Radioactive Decay - The breakdown of unstable isotopes into a stable element; gives off heat, Planetary Differentiation - The separation of layers by density, Lithosphere - Outermost layer made up of crust and upper mantle broken into tectonic plates, Asthenosphere - Soft layer of the mantle that flows, Convection Current - Movement of different densities due to difference in temperature, Seismic Waves - A wave of energy that travels through earth and in all directions from an earthquake, P Waves (primary waves) - Fastest seismic waves that travel through all states of matter, S Waves (secondary waves) - Slower seismic waves that travel through solids only, Shadow Zone - Areas where seismic waves are expected to arrive but do not because the seismic waves are blocked or bent.,

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