سرگرمی و طنز ورزشی کارتون و انیمیشن علم و فن آوری خودرو و وسایل نقلیه آموزش موسیقی و هنر اخبار و سیاست حیوانات و طبیعت بازی حوادث مذهبی
It is pretty amazing how much we know about the Earth’s interior, given that we can only directly observe a tiny fraction of it. Due to our lack of access to the Earth’s interior, scientists must rely on indirect observations. One way they do this is by studying the movement of pressure waves as they travel through the interior of the Earth.


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