Question

what are the levels of interior of the earth ?

Answer 1

Mantle, core and crust are the levels of interior of the earth.
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Answer 2

Earth can be divided into three main layers,
the core, the mantle and the crust.
Each of these layers can be further divided into two parts: the inner and outer core,
the upper and lower mantle and the continental and oceanic crust.
Both the inner and outer core are made up of mostly iron and a little bit of nickel.