Internal Structure Of The Earth

What is the evidence that we understand the internal structure of the earth? In the 21st century, understanding of the composition of the Earth begins to deepen. Early predictions brought a fairly strange and strange idea of ​​what constitutes our planet, but now scientists can confirm that the earth is composed of their ideas. Real images become clearer from experimental information sources and other sources. How do scientists perceive that each part of the earth consists of various components? Outermost layer

The inner structure of the earth is a spherical shell, ie the outer silicate solid crust, the highly viscous asthenosphere, and the mantle The outer core of the liquid is much less viscous than the mantle, the core becomes stronger It is. Scientific understanding of the internal structure of the earth is based on observations of topography and depth, observation of outcrop rocks, samples of volcanoes and volcanic activities from deep to the surface, earthquake wave analysis, earth's gravity and magnetic field measurements, Based on depth Experimental study of internal solid under pressure and temperature

Since seismic waves usually propagate effectively when interacting with the internal structure of the Earth, we provide a high resolution noninvasive way to study the interior of the Earth. One of the earliest important findings (proposed by Richard Dickson Oldham in 1906 and clearly stated by Harold Jeffries in 1926) is that the outer nucleus of the earth is liquid. Since the S wave does not pass through the liquid, the liquid core makes a "shadow" on one side of the earthquake, but direct S waves are not observed as opposed to the earthquake. In addition, the P wave passes through the outer core much more slowly than the mantle.