3
1. Crust: Tectonic activity, continents, ocean basins.
2. Mantle: Convective currents, plate movements, earthquakes, volcanoes.
3. Outer Core: Magnetic field, molten iron, nickel.
4. Inner Core: Heat, pressure, geothermal energy.
Added 8/16/2023 12:24:15 AM
This answer has been confirmed as correct and helpful.