1. The study of the world , scientists have tried to find ways. To study the structure of the world, both directly and indirectly. The attempt to use evidence Can be found The theory Principles of science and technology. In order to answer such doubts in the human limits of technology for studying the structure of the world directly. And while the study of borehole survey to collect rock samples. The deepest hole drilled to explore current drilling has only a depth of 12.3 kilometers for studying the internal structure of the Earth indirectly. From studying seismic caused by the earthquake and the human trials to study the structure of the seismic movement through the world. Waves used in the analysis is the primary waves (Primary waves, P waves) and a secondary (Secondary waves, S waves), which is the wave of the intermediaries (Body wave) by seismic such properties as follows: - a. P can be through any intermediary status. And faster than S waves - S waves can travel through the unique medium of solid otherwise.
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