Grand Canyon Field Institute http://www.grandcanyon.org/fieldinstitute/virtualtour.asp
Maps of U.S. States http://www.sitesatlas.com/Maps/usstates.htm
Interactive Map of U.S. including virtual tours of some major cities http://www.maps-of-mexico.com/world-virtual-tours/north-america/united-states-map.shtml
Geology of the Grand Canyon http://www.kaibab.org/geology/gc_geol.htm
United States Botanical Gardens http://www.usbg.gov/virtual-tour/index.cfm
Climate Map of North America
World Migration Map
Physical Map of North America
Population Density of North America
Vegetation map of North America
Elevation Map of North America
This site contains all sorts of information on individual states including the date that the state entered the Union. http://www.50states.com/
The Union of Concerned Scientists website is a site where you can search to find out about environmental and energy concerns in different states. http://www.ucsusa.org/
This a website where you will find information on the economy of each state. Both chief products and energy resources are listed. http://www.economywatch.com/world_economy/usa/states/index.html
U.S. Census Bureau http://www.census.gov/