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In this activity, learners work in teams to study the observation skills essential to scientific research.

Play keep away from your cat by using a static charge to suspend a piece of tinsel in the air. This Exploratorium produced activity also features videos to help create and learn about this phenomenon.

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

In this activity, learners conduct an experiment to explore how water flows up from a tree's roots to its leafy crown.

In this activity (on page 2 of the PDF under GPS: Cactus Activity), learners will develop their own version of a tool used by biologists, a dichotomous key, by collecting all their left shoes.

In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.

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.

In this group activity, learners will explore the characteristics, functions and uniqueness of the mangrove tree.

In this outdoor activity, learners cut through and investigate rotten logs and then make log-profile puzzles for each other.

This activity (on pages 19-24) introduces learners to the rain forest's layers—emergent, canopy, understory, and forest floor—and has learners make paper lianas (vines that live attached to trees) and