⬡ Outer Zone
Atmosphere
Thin envelope of air forms around Earth. Contains N₂, O₂, CO₂ and other gases.
Hydrosphere
Oceans, seas, lakes & rivers — all water bodies on Earth's surface.
Biosphere
Continents that host living and non-living organisms. The zone of life.
◈ Inner Zone
Crust / Lithosphere
Silica & aluminium (SIAL). Conrad discontinuity marks its lower boundary.
Mesosphere
Middle region below the crust. Bounded above by Conrad & below by Moho discontinuity.
Mantle (Sima)
Silicate & manganese. Slow convection currents drive plate tectonics.
Outer Core (Liquid)
Liquid nickel & iron. Generates Earth's magnetic field by convection.
Inner Core (Solid)
Solid nickel & iron — Barysphere. Extreme pressure keeps it solid despite heat.