American Geological Institute, 4220 King St., Alexandria, VA 22302 United States
American Geological Institute, 4220 King St., Alexandria, VA 22302 United States ;
Department of Mathematics and Science Education, Illinois Institute of Technology, 10 West 32nd St, Chicago, IL 60616 United States ;
Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 United States ;
American Geological Institute, 4220 King St., Alexandria, VA 22302 United States ;
American Geological Institute, 4220 King St., Alexandria, VA 22302 United States ;