Follow the link to view the October 2013 video lesson based off the Rock Perspectives column I wrote.
http://www.youtube.com/watch?feature=player_embedded&v=gTAFWBp5OuI
Follow the link to view the October 2013 video lesson based off the Rock Perspectives column I wrote.
http://www.youtube.com/watch?feature=player_embedded&v=gTAFWBp5OuI