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In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

This marine biology activity (on pages 11-17) introduces learners to kelp (seaweed) forests that grow in the ocean and are home to many species of sea animals.

This activity (on pages 16-23) lets learners measure each other's vital signs—the signs that help doctors understand what's going on in a patient body.

In this activity (on pages 34-39), learners make a fairly detailed model of DNA using licorice and gumdrops.

In this activity (on pages 12-15), learners make a crater model and test the effects of weather (rain) on its surface.

This activity (on pages 23-27) lets learners simulate the work of scientists who take core samples of Earth's rocky layers to determine geological history.

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

In this activity (on pages 29-35), learners examine water pollution and filtration.

In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

This activity (on pages 38-43) has learners simulate the way scientists track and map the movement of otters in the wild using radio trackers.

This activity (on pages 24-29) combines science and art to introduce learners to how different animal pollinators spread pollen from one plant to another, and how certain shapes, colors, and smells of

In this game (on pages 14-21), learners explore how each human being inherits genetic traits such as eye color.

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.

This reading and writing activity (on pages 2-9) teaches what plant parts should be avoided, how a person can get rid of toxins, symptoms of plant poisoning, and how plants create poisons to repel pre

In this activity (on pages 9-14), learners dissect a real flower -- the kind of work botanists do.

This activity (on pages 7-13) has pairs of learners survey an array of similarities and differences between them.