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In this online interactive, learners use fossils to infer temperatures 55 million years ago, at the sites where the fossils were found.

In this very hands-on lesson, learners will investigate dendrochronology (the study of tree rings to answer ecological questions about the recent past) and come up with conclusions as to what possible

This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.