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Activity 2 Read the article below and answer the questions that follow.
Seismic wave, vibration generated by an earthquake, explosion, or similar energetic source and spread within the Earth or along its surface. Earthquakes generate four principal types of elastic waves; two, known as body waves, travel within the Earth, whereas the other two; called surface waves, travel along its surface. Seismographs record the amplitude and frequency of seismic waves and yield information about the Earth and its subsurface structure. Artificially generated seismic waves recorded during seismic surveys are used to collect data in oil and gas prospecting and engineering.
Questions:
1. What are seismic waves? 2. Give the two types of seismic waves. 3. Give some importance of seismic waves?
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