description of the earth and the different layers
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Crust:
The crust is the outermost layer of the planet, the cooled and hardened part of the Earth that ranges in depth from approximately 5-70 km (~3-44 miles).
Upper Mantle:
The mantle, which makes up about 84% of Earth's volume, is predominantly solid, but behaves as a very viscous fluid in geological time.
Lower Mantle:
The lower mantle lies between 660-2,891 km (410-1,796 miles) in depth.
Outer Core:
The outer core, which has been confirmed to be liquid (based on seismic investigations), is 2300 km thick, extending to a radius of ~3,400 km.
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