Earth’s Internal Structure: Crust, Mantle, Outer Core, and Inner Core Explained #3886957 (License: Personal Use)

This diagram illustrates Earth’s four primary concentric layers: the thin silicate crust (5-70 km thick), the viscous mantle (2,900 km thick), the liquid iron-nickel outer core (2,200 km thick), and the solid inner core (1,220 km radius). The layers are distinguished by composition, density, and physical state, inferred from seismic wave behavior and geophysical modeling.

Used in educational science pages, geology textbooks, and earth science curricula to explain planetary structure; targets students, educators, and curious learners seeking foundational knowledge of Earth’s interior.