1. The study of the world
.Scientists have been trying to find methods To study the structure of the world both directly and indirectly by trying to use the evidence can be found, including the use of scientific theories and principles of various fields. And modern technology.
.At present, humans have limitations in technology for the study of the structure of the world by direct And now studies from the borehole survey for rock samples12.3 kilometers only
for the study of the internal structure of the world indirectly. From the seismic caused by earthquake and from human experiments
.Study of structure seismic world from moving through the world. The waves used in this analysis is the primary wave (Primary, waves P waves) and secondary wave (Secondary, wavesS waves) which is the wave in the medium (Body wave) by such a treasure is as follows: seismic waves
- P can through intermediaries, every state. And faster than the wave S
.- wave S can move through only the solid medium.
การแปล กรุณารอสักครู่..
