USGS topographic Map info http://erg.usgs.gov/isb/pubs/booklets/symbols/
elements practice http://education.jlab.org/itselemental/index.html
rock cycle animation http://www.geolsoc.org.uk/gsl/site/GSL/lang/en/page3892.html
earth day ideas http://www.recyclingcenters.org/earth_day_projects_and_tips.php
topographic activity http://reynolds.asu.edu/topo_gallery/intro_start.htm
types of rocks & rock cycle
town of southborough GIS page
Black hole article
Birth of Stars article
jupiter article
inhabitable planets
comet article
spacecraft article
rock cycle practice
solids, liquids, & gases youtube clip http://www.youtube.com/watch?v=guoU_cuR8EE