Source: Teaching Ideas. (n.d.). Retrieved May 11, 2015, from https://www.pinterest.com/pin/159737118009142282/
Source: The Rock Cycle. (2013, February 13). Retrieved May 11, 2015, from https://www.youtube.com/watch?v=uAAeFB7Tv5A
Source: Types of Rocks & Rocks Cycle Video for Kids by makemegenius.com. (2012, April 15). Retrieved May 11, 2015, from https://www.youtube.com/watch?v=Pwlr2uSSgcc
Source: Introduction. (n.d.). Retrieved May 11, 2015, from http://www.learner.org/interactives/rockcycle/index.html
