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This textbook chapter introduces the buffalo as a keystone species, and describes the environmental impacts of its near extinction, including today’s predominance of non-native species in the Great Plains. Human activities that contribute to... (View More)

In this engineering challenge, student teams are introduced to the engineering design process, and then construct and test an earthquake-resistant structure. The lesson plan includes teacher support, student worksheets, multimedia assets, and links... (View More)

Through an analysis of data sets on four parameters - sea ice totals, sea surface temperatures, near surface temperatures and surface type - students must decide whether the Arctic is experiencing climate change and predict any potential effects on... (View More)

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