What are the main evidence of the layered nature of earth's structure
Answers
The internal structure of the Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core. Scientific understanding of the internal structure of the Earth is based on observations of topography and bathymetry, observations of rock in outcrop, samples brought to the surface from greater depths by volcanoes or volcanic activity, analysis of the seismic waves that pass through the Earth, 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.
The main evidence of the layered nature of earth's structure,are as follows -
• During the deep drilling process in order to extract the underground minerals and other resources,we came to know that the density of the materials increases as we go deeper.
Which means, there are different layers in the internal portion of the earth,of different densities. The uniform nature is not applicable here due to the change of density.
• When,the seismic waves travel through the internal part of the earth,the waves tend to change their travelling path,speed into the different internal parts of the earth.
If there is uniform nature in the internal portion of the earth,then the seismic waves should also travel in an uniform method.