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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.

In this design challenge, learners use their creativity and imagination to design and test a wildlife crossing for their favorite animal.

In this outdoor activity and bingo-like game, learners explore why and how seeds spread far from the plants that produce them.

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.

In this activity, learners explore the different salinities of various sources of water by taste-testing.

Learners follow a three-step process to start their own rock collection.

In this activity learners will create paint out of natural materials. Explore your natural world (or your fridge) and find berries, leaves, or flowers to find a great base for your paint.

Some aquatic organisms live in open water, while some live in soil at the bottom of a body of water.

In this activity, learners will estimate the sizes of balls to learn how to estimate the size of hail. Learners will compare their estimates to the estimates of their peers and the real measurements.

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.

In this quick activity, learners observe how the added sugar in a can of soda affects its density and thus, its ability to float in water.

In this up-cycling activity, learners recycle plastic bags and repurpose them into useful wallets.

In this collecting/comparing activity, learners work with samples of sand from different places like a lakefront, river, or ocean beach.

Learners use M&Ms® (or any other multi-color, equally-sized small candy or pieces) to create a pie graph that expresses the composition of air.

In this activity, learners explore how various energy sources can be used to cause a turbine to rotate.

In this activity, learners will be working with predictions with a time frame of one week, or longer. Start by planting seedlings.

Did you know that a Slinky makes a handy model of earthquake waves?

In this activity, learners create models of erosion and floods and learn to recognize both in their environment.

In this activity, learners explore why the sky is blue. Learners model the scattering of light by the atmosphere, which creates the blue sky and red sunset, using a flashlight and clear glue sticks.

In this activity, learners capture and observe planaria, which are worms that eat tiny pond critters.