1. study the world structure. Scientists have tried to find ways to study the structure, both directly and indirectly, by attempting to use the evidence can be found, including the use of any other scientific theory and modern technology in order to answer such questions, There are human limitations in current technology for the study of the structure of the world and now has a hole drilled from the study survey to collect rock samples, drilling holes, which explore the deepest drilling only in the current depth 12.3 kilometres only. For the study of the internal structure of the Earth indirectly obtained from seismic wave studies resulting from the earthquake, and from human trials. The study of seismic waves at the world structure from moving through the world. The waves used in the analysis is the primary waves (Primary waves, P waves) and secondary waves (Secondary waves, S waves), which is in the medium wave (Body wave) seismic waves by such important treasure. As follows: P-wave can be that every State through intermediaries and has more than S waves, speed. S-wave can move only through a solid medium only.
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