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CK-12 Foundation
CK-12 Earth Science Concepts for Middle School
Explore a variety of science concepts in an interactive textbook created for middle school scholars. A lengthy table of contents takes readers to pages comprised of a subject overview, outline, and summary. Follow links further to find...
John Wiley & Sons
John Wiley & Sons: Water Pollution & Treatment
Resource provides information on environmental issues of water pollution with an established learning objective. A case study about the Illinois River is provided explaining the environmental impact of water pollution. Environmental...