CK-12 Foundation
Ck 12: Fourth Grade: Earth Science: Erosion and Deposition by Flowing Water
[Free Registration/Login may be required to access all resource tools.] Discusses how flowing water causes erosion; describes how runoff, streams, and rivers change Earth's surface; and identifies features caused by groundwater erosion.
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Planet Ark: World Environmental News
Welcome to Planet Ark's daily Reuters World Environment News - the most comprehensive source of environmental news on the Net. To read previous news stories, please use the search engine below to find stories relating to any...