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11 May, 05:43

1. Describe the vibration caused by primary waves.

2. Described the vibration caused by secondary waves.

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  1. 11 May, 07:28
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    Energy released during an earthquake travels in the form of waves around the Earth. Two types of seismic wave exist, P - and S-waves. They are different in the way that they travel through the Earth ... They are transverse waves which mean the vibrations are at right angles to the direction of travel.
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