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National Wildlife Federation
Why All The Wiggling on the Way Up?
Some of the CO2 emitted by burning fossil fuels is removed from the atmosphere by natural sinks, such as the ocean. The fifth engaging lesson in the series of 21 examines the CO2 data from three very different locations. It then makes a...
Curated OER
Symbols of Freedom
Students investigate symbols of the United States in this unit. They exam the Liberty Bell, the American Flag, the President, and the Bald Eagle.