http://maps.nationalgeographic.com/topo/

Igneous Rocks

rock walk map

http://csmres.jmu.edu/geollab/Fichter/MetaRx/index.html http://geology.wr.usgs.gov/docs/usgsnps/rxmin/rock3.html

ABAG Earthquake Maps and Information Southern California Earthquake Center (SCEC) Home Page

"We Don't Have Earthquakes in Colorado, Do We?"

Stream discharge data:
Real time flow data for the Animas River at Durango:
http://water.usgs.gov/co/nwis/rt

Water Resources of the United States – http://water.usgs.gov

EPA's Surf Your Watershed – http://www.epa.gov/surf/
FEMA National Flood Insurance Program – http://www.fema.gov/nfip/ 

Missionary Ridge realtime precipitation gages - http://co.water.usgs.gov/fires/missionridge/index.html 

Groundwater in the Southwestern United States:
Southwest Groundwater Resources USGS
http://az.water.usgs.gov/swgwrp/Pages/Overview.html

Precipitation data:
Monthly precipitation and mean temperature data for selected stations in the US.  U.S Historical Climatology Network. 
http://cdiac.esd.ornl.gov/epubs/ndp019/ushcn_r3.html

                                                                                     Plot of monthly precipitation values (NOAA) 
http://www.ncdc.noaa.gov/ghcn/ghcn.SELECT.html

                   
Water Resources of Colorado – http://co.water.usgs.gov/

Colorado Water Knowledge – http://waterknowledge.colostate.edu/

The Earth's Atmosphere

Severe and Hazardous Weather - Tornadoes, Hurricanes, Hail, Thunderstorms, Blizzards