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.

Earth's Interior

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