Distinct layers,

• continental crust - approx 6~60km thick
  calcium-iron-magnesium silicates above, and aluminum-sodium-potassium silicates below
  temperature about 1900 Fahrenheit at bottom
• oceanic crust - approx 3.2km thick
  aluminum-sodium-potassium silicates
• mantle - approx 2896km thick, thicker under oceans
  dense, semi-molten layer of iron-magnesium silicates
  temperature about 6700 Fahrenheit
• outer core - approx 1995km thick
  molten layer of 90% iron, 9% nickel, 1% sulfur
  temperature about 4000 Fahrenheit
• inner core - approx 2754km radius
  dense, hot layer of 90% iron, 9% nickel, 1% sulfur