MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Seismic waves. Cutaway computer illustration of a section through the Earth, showing the time taken for different types of seismic waves to propagate around the globe. Seismic waves are waves of energy that travel through the Earth's layers as a result of an earthquake explosion or a volcano that gives out low-frequency acoustic energy.
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