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A solid consists of many small particles. Elastic waves transfer energy from one point to another by the movements of those small particles. The particles themselves are not transported; they only vibrate with small displacements about their respective equilibrium (or rest) positions. Their vibrational movements can propagate energy in the form of a wave. A wave is an energy-transport phenomenon that transports energy through a medium without transporting matter. Any particular small particle simply vibrates about its own rest position while the wave is passing, and it returns to its rest position and remains there after the wave has passed. The initial energy that created the wave spreads out with the wave. An electromagnetic wave is nature’s way of transporting energy from one place to another at the speed of light.