Which layer is hot, solid material between the crust and earths core?

Eastern europe’s population growth can be attributed to these factors. select all that apply migration

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called