Earth Science Week 2006 will begin with the first International EarthCache Day from 1 to 2 p.m. Sunday, Oct. 8, 2006, on the National Mall in Washington, D.C. The public is invited to join the EarthCache team from the Geological Society of America, in association with Groundspeak Inc., the American Geological Institute, and the National Park Service, in celebrating the exciting educational geocaching tool of EarthCaching at this event on the grounds northwest of the Washington Monument.