inner structure of the earth (for RAILWAYS AND SSC EXAM and also for other exam like store keeper )

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The interior structure of the Earth is layered in spherical shells, like an onion. These layers can be defined by either their chemical or their theological properties. Earth has an outer silicate solid crust, a highly viscous 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.
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earth structure, the earth

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