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PBS
Nh Pbs: Nature Works: Ecosystems
How would you define an ecosystem? Check out this educational resource to learn more about the living and nonliving parts of different ecosystems.
Other
Pittsburg Post Gazette: Ohio Embankments Evidence of Sophisticated Culture
News article offering details of Great Circle of Newark Earthworks.
Ducksters
Ducksters: Chemistry for Kids: Chemical Reactions
A site discussing chemical reactions in chemistry including reaction rate, types of reactions, reagents, reactants, catalysts, and inhibitors.