3 Layering occurred early in Earth’s formation temperature within the planet increased due to radioactive decaymelting occurred and the more dense materials were pulled to the coreHeat from the core and radioactivity within the mantle keep the mantle hotChanges in temperature and pressure affect the physical properties and mechanical behavior of Earth materials
4 Crust Outermost layer Cool, rigid shell 1% of Earth’s mass Oceanic Crust and Continental Crust
5 Mantle Almost 2/3 of Earth’s mass Lithosphere – upper mantle and the crustMade up of mostly igneous rockAsthenosphere – partially melted due to increases in pressure and temperature
6 Core Heaviest (most dense) material Solid inner core Liquid outer core b/c of the extreme pressures even though the temperatures are highSolid inner coreLiquid outer coreNearly 1/3 of Earth’s massFlow of Iron in outer core – Earth’s magnetic field
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