Question

what is meant by mantle

Answer 1

The mantle is a layer between the crust and the outer core. Earth's mantle is a silicate rocky shell with an average thickness of 2,886 kilometres (1,793 mi). The mantle makes up about 84% of Earth's volume. It is predominantly solid but in geological time it behaves as a viscous fluid.

Answer 2

$\sf\bold{Mantle}$:-

It is the second layer of the earth . It extends upto depth of 2900km. It forms 84% of the volume of the earth.