http://curriculum.calstatela.edu/courses/builders/lessons/less/les2/erosion.html - World Builders, Charter School of education explains various types of erosion 

http://www.geog.ouc.bc.ca/physgeog/contents/11g.html Fundamentals of Physical geography explain erosion 

http://www.irim.com/ssm/ssm00050.htm - Intermountain Resource Inventories explain various types of erosion 

http://www.geography.about.com/science/geography/library/weekly/aa082500a.htm  About.com explains various types of erosion 

http://www.ssec.org/braintre/south/fallano/Rivers2/water1.htm  water erosion 

http://www.hrc.wsu.edu/enviroed/watersheds/Watershed_Education/erosion.htm What is erosion? From Center for Environmental Education at Washington State University  

http://www.nhq.nrcs.usda.gov/land/meta/m5112.html - dot map shows wind and water erosion

http://www.wrc.govt.nz/ws/ww/erosion.htm - water erosion

http://members.aol.com/bowermanb/land.html

http://tvl1.geo.uc.edu/ice/Image/imageref.html glacial erosion information

http://tvl1.geo.uc.edu/ice/Image/eropro/eropro.html - glacial erosion pictures

http://www.epa.gov/airmarkets/acidrain/ EPA report on Acid rain