The three types of rock October 21, 2011 Filed under: geology | humor Hah. My sister sent this to me. Related Posts I get the strangest email. May 7, 2010 A sign of the times November 9, 2020 infrastructure Christchurch January 15, 2006 field-camp | new-zealand ← Previous Post Extrapolating the screen size of Android mobile phones over time. Next Post → Stop SOPA