Elad Levintal, Ben-Gurion University of the Negev, Sede Boker, Israel, Hovav Zafrir, Geological Survey Israel, Jerusalem, Israel, Maria Ines Dragila, Oregon State Univ, Corvallis, OR, United States and Noam Weisbrod, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, Israel