References

Alexander, N., 1983. The living soil. AIMS multimedia. Retrieved December 23, 2006, from http://gpb.unitedstreaming.com.

Georgia Department of Education ,1999-2005. QCC Standards and Resources. Retrieved on August 24, 2005, from http://www.glc.k12.ga.us/passwd/search/srchqcc/Standard.asp?SubjectID=4&Grade=8&CSID=310&keywords=&CSType=S&View=SL.

Georgia Department of Education, 2001. CRCT content descriptions science.

Holt, Rinehart, and Winston, 2001. Earth Science. ISBN 0-03-051954-3.

National Park Service, 2005. Devil’s Tower geology. Retrieved December 23, 2006, from http://www.ultimatewyoming.com/HTML/sectionpages/sec3/DevilsTower/devilstowergeology.html.