coalesce - to collide and stick together , planetary differentiation - the planet formed in different layers by density , radioactive decay - unstable elements break down & release heat energy , gravitational potential energy - the downward pull of gravity , silicates - less dense rocks mostly in the crust , composition - chemical makeup , 3 layers by composition - crust, mantle, core , 5 layers by physical properties - litho, astheno, meso, o.c., i.c. , asthenosphere - layer of mantle where convection occurs , lithosphere - layer attached crust and mantle , outer core - liquid layer , inner core - most dense, solid layer , crust - coolest, least dense layer , ocean crust - thinner, more dense crust , continental crust - thicker, less dense crust ,

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