- Crust: The outermost layer, forming Earth's surface, 0-100 km thick.
- Lithosphere: Composed of the crust and the uppermost solid mantle; rigid and brittle.
- Mantle: The layer between the crust and core, made of hot, solid material.
- Asthenosphere: The soft, solid rock layer within the upper mantle where convection currents occur; located below the lithosphere.
- Outer core: A liquid layer of molten iron and nickel surrounding the inner core, beginning at approximately 2,900 km depth.
- Inner core: The dense, solid sphere of iron and nickel at Earth’s center, beginning at approximately 5,100 km depth.
- Core: The deepest layer, consisting of the inner and outer cores, made primarily of iron and nickel.
- Convection current: The movement of heat through fluid due to temperature differences; occurs in the asthenosphere.
Parent Tip: Review the logic above to help your child master the concept of layer of the earth worksheet.
