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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

This activity has three story puzzles learners can solve to learn about life in the Arctic.

In this Bob the Builder(TM)-themed activity, learners go on a nature walk outside and describe what they observe using their senses.

This activity introduces learners to Native Americans as people who depended upon nature in the past and continue to emphasize the importance of nature in the present.

In this environmental activity (page 6 of the PDF), learners identify household products that are recyclable and explore the different types of recyclable plastics.

In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

Learners make their own paper. They start by shredding old newspaper, clean toilet paper, and clean paper towels.

In this activity, learners build one or more edible coral polyps and place them together to form a colony.

In a class demonstration, learners observe a simple water cycle model to better understand its role in pollutant transport.

This is an activity about discovering the colors and beauty of nature. Learners will spend time outdoors, matching paint chip samples, colored paper, or colors of clothing to those found in nature.

In this activity, learners explore the Great Plains.

In this activity, learners take an indoor nature walk and discover various objects that have been brought in from the outdoor environment.

In this crafty chemistry activity (on page 2 of the PDF), learners make their own paper from used paper they may have otherwise thrown away.

In this activity, learners explore the web of connections among living and non-living things.

This is an activity where learners will discover what types and how many insects live in their own backyard.

In this activity about camouflage, learners create a model that shows how a flounder is able to blend into a variety of environments.