The Rock Cycle

https://www.learner.org/interactives/rockcycle/

http://www.oum.ox.ac.uk/thezone/rocks/cycle/index.htm
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http://www.rocksforkids.com/RFK/howrocks.html

http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html

http://www.homeadvisor.com/r/rock-collecting/#.WRDgc4krLLE
(Special thanks to Ava Barnes for finding this one for me.)