Assess students' recall of the Earth's four main layers—the crust, mantle, outer core, and inner core—by identifying each layer’s composition, physical state (solid or liquid), relative thickness and density, approximate temperature trends, and primary roles (e.g., plate tectonics, magnetic field generation). Content is limited to basic definitions, comparisons, and straightforward identification tasks suitable for grades 6–8 at a medium difficulty (Remember cognitive level).