explain how the structure of earth's interior effects seismic wave speed and direction
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When earthquakes happen, Seismic energy is produced. This energy is transmitted as body waves which travel below the surface of earth, as well as waves which travel along earth’s surface, known as surface waves.
Seismic waves travel at varying speeds when they pass through different types of matter. The composition of earth’s different layers is different. Therefore, when the seismic waves reach boundaries of rocks of the earth’s different layers, their speed and direction will change accordingly.
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