outer core - second most dense layer, crust - least dense layer , lithosphere - make up the plates (mantle + crust) , asthenosphere - convection in the mantle happens , earthquakes - rocks move suddenly and release energy , Swaves - cannot travel through liquid , mantle -  molten plastic-like solid, increase speed - Pwaves travel through solids , decrease speed - Pwaves travel through liquid , compression - convergent plates , tension - divergent plates , shearing - transform plates , continental drift - Pangaea split up , sea-floor spreading - happens at a mid-ocean ridge , Al Wegner - all continents were once together , Pangaea Proof - same fossils on diff continents, rock evidence - same mnts on diff continents , mid-ocean ridge - older rocks are farther way ,

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