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This activity investigates how bark beetles can threaten forests by having learners estimate the number of infected trees from a photo.

In this activity (p.23 of PDF), learners dye wool with fungi. Learners discover that natural chemicals in fungi can dye wool different colors.

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 model erosion using a clear shoebox and sand or soil.

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

In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.

In this activity, learners will investigate how shorebirds and seabirds are extremely vulnerable to changes in their environment, whether human-induced or otherwise.

In this engineering/design activity, learners make a kite, fly it, and then work to improve the design. Learners explore how their kite design variations affect flight.

In this sunny day experiment, learners measure and compare how quickly light and dark colored materials absorb heat.

In this activity, learners observe and describe the physical and behavioral characteristics of insects, including crickets.

In this activity about daily rhythms (on page 17 of the PDF), learners will explore circadian patterns in humans, animals and plants.

In this activity, learners will see how UV light affects colors over time by making their own sunprint on construction paper.

This activity demonstrates liquefaction, the process by which some soils lose their solidity during an earthquake.

In this graphing exercise (page 2 of the pdf), learners compare their own height to the length of various sharks.

This activity is on page 8 of the pdf, part of the Sea Life Discovery Box. This is an activity exploring the characteristics of fish.

In this activity, learners use a flashlight, a glass of water, and some milk to examine why the sky is blue and sunsets are red.

This is a virtual representation of a sound mixer containing pre-looped sounds of animal, insect, and environmental noises.

Learners build a wind turbine and test it to see how much energy is created.

In this activity, learners model hot spot island formation, orientation and progression with condiments.

In this activity, learners will explore how animal in cold areas stay warm.