Structure of Earth

Layers of the Earth

• crust - is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite.
• Mantle -  is a layer inside a planetary body bounded below by a core and above by a crust.
• Outer core -  is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth's solid
• The inner core -  is the innermost geologic layer of the planet Earth.
• Mass - The force exerted by Earth's gravity can be used to calculate