http://www.harcourtschool.com/activity/types_of_land_2/cliff.html
http://www.earthkam.ucsd.edu/public/students/activities/landformations/index.shtml
http://www.fossweb.com/modules3-6/Landforms/index.html
http://www.eduplace.com/kids/socsci/books/applications/imaps/maps/g2_u2/index.html
http://www.mrnussbaum.com/wlandforms.htm
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