For the survey, by the way, that is a measure of precision of seismic sound waves to send under the ground by ignition or bumps on the ground that the wave vibration that was passed down to below the surface will reflect back from the stone floor below the ground to the surface world. On the characteristics of wave reflection and to log in to the receiver and is saved by a tool, called a geophone, which recorded data will be processed until it can be displayed in the style of the picture represent the position and appearance of the stone floor structure below.
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