•	Tectonic cycle
–	Movements/ interactions by which rocks are cycled from the mantle to the crust and back
–	Includes earthquakes, volcanism, and plate motion, driven by convection in the mantle
–	As a result, seafloor recycles itself every 200 million years
•	Earth’s internal heat
–	Conduction
•	Slow release of heat
–	Convection
•	A form of heat transfer in which hot material circulates from hotter to colder regions, looses its heat, and then repeats the cycle