Question

what is called the mantle

Answer 1

The mantle is the mostly-solid bulk of Earth's interior. The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth's total volume.
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Answer 2

just like an onion the earth is made up of several layers.the uppermost pyer is crust. just below the crust is the mantle which extends up to depth of 2900km