Respuesta :
Their relative densities of Earth's materials can be inferred by their arrangement in layers.
Explanation:
Earth is made of many layers. There are many characteristics that are associated with each of these layers. The outer most layer to the inner most layer of the earth has different materials and are composed of the crust, mantle, outermost core and the innermost core.
The properties will be different for each layer and there will also be difference in the pressure and temperature. Seismic monitoring process helps in finding the densities of the materials that compose each layer. Hence the layered arrangements of Earth helps to determine the relative densities of the materials that compose those layers.
Our modern, scientific understanding of the Earth's interior structure is based on inferences made with the help of seismic monitoring. In essence, this involves measuring sound waves generated by earthquakes, and examining how passing through the different layers of the Earth causes them to slow down. The changes in seismic velocity cause refraction which is calculated (in accordance with Snell's Law) to determine differences in density.
These are used, along with measurements of the gravitational and magnetic fields of the Earth and experiments with crystalline solids at pressures and temperatures characteristic of the Earth's deep interior, to determine what Earth's layers looks like. In addition, it is understood that the differences in temperature and pressure are due to leftover heat from the planet's initial formation, the decay of radioactive elements, and the freezing of the inner core due to intense pressure.
Formation of Earth's layered structure
-Chemical segregation established the three basic divisions of Earth's interior (lighter material floats on top of heavier material)
-Metals (heavy) sank to the center (core)
-Low density melt rose to form a primitive crust
-Residual rock remained between crust and core (Primitive Earth atmosphere evolved from gases released from Earth's interior
Layers defined by composition (Crust, Mantle, Core)
-Other layers defined by physical properties (Lithosphere, Aesthenosphere, Mesosphere, Inner and Outer Core)
