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This Earth science resource shows middle and high school students how changes in climate can be determined by studying such natural features as ice layers, tree rings, and coral growth bands. Students are instructed to click on an image of each feature for additional information. In the tree rings feature, for example, students view additional images and read about how the rings are formed, the variables that influence their thickness, and how scientists collect and interpret data from tree rings. Copyright 2005 Eisenhower National Clearinghouse
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