1. to study the structure of the world Scientists have tried to find different ways to study the structure of the world, both directly and indirectly, by attempting to use the evidence that can be found, as well as the main branch of the scientific theory and modern technology in order to answer these questions. At present, there are human limitations, technology for the study of the structure of the world directly and now has students from borehole survey to collect rock samples, drilling a hole that deep exploration drilling is currently the most in depth 12.3 km only. For the study of the internal structure of the Earth indirectly, derived from seismic wave studies arising from the earthquake and from the human trial. Study on seismic wave structure of the world from moving through the world. The waves used in the analysis are the primary waves (Primary waves, P waves) and secondary waves (Secondary waves, S waves), which is a wave in a medium (Body wave) seismic waves that they have important properties. As follows: -P waves can go through any intermediary status and speed more than S waves. -S waves can move through a solid medium-specific only.
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