Bibliography

__**Field Training - Sunday, November 4, 2012**__ Subway Cave, Shasta County, California - Lassen National Forest Skylight Cave, Highway 44, Shasta County, California - Lassen National Forest Hat Creek Overlook, Old Station, California - Lassen National Forest Spattercone Trail, Hat Creek, California - Lassen National Forest

These are the web sites and periodicals we used in our research. http://dictionary.reference.com/browse/Volcano?s=t http://dictionary.reference.com/browse/Vent?s=t http://en.wikipedia.org/wiki/Lava_tube http://dictionary.reference.com/browse/calderas?s=t http://ares.jsc.nasa.gov/ares/eeab/index.cfm http://vulcan.wr.usgs.gov/Glossary/StratoVolcano/framework.html GraphicMaps.com