crust, mantle, outer core, the inner core.
- The mantle is hot, flowing, thick solid layer of Earth between the crust and the core where convection occurs.
- The crust is the thinnest layer and solid outermost layer of the Earth above the mantle
- core is earth's innermost layer, which is mostly iron and includes the solid inner core and liquid outer core
- oceanic crust is earth's crust located under the ocean; made of mostly heavy and dense basalt.
- inner core is a dense sphere of solid iron and nickel at the center of Earth
- outer core is layer of molten (liquid) iron and nickel that surrounds the inner core of Earth
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