Inner Core -- hottest part of the earth.
Outer Core -- a liquid layer.
Mantle -- dense, mostly solid layer between the outer core and the crust.
Crust -- relatively thin outer layer of the earth, split into plates (52 altogether, 14 major, 38 minor).
Convection Currents -- occur in the mantle, cause the plates to move and determines the direction of movement.
Continental Crust -- older, less dense, cannot sink, cannot be renewed or destroyed.
Oceanic Crust -- newer, denser, can sink, can be renewed or destroyed.
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