why is there an abrupt change in the speed of seismic waves as they travel inside the earth ? it is because this make waves are ?

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why is there an abrupt change in the speed of seismic waves as they travel inside the earth ? it is because this make waves are ?

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The waves are refracted as they travel through the Earth due to a change in density of the medium. This causes the waves to travel in curved paths. When the waves cross the boundary between two different layers, there is a sudden change in direction due to refraction.

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