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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.

$1 - $5 per group Ages 11 - 18 30 to 45 minutes
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In this design challenge, learners use their creativity and imagination to design and test a wildlife crossing for their favorite animal.

$1 - $5 per student Ages 6 - adult 30 to 45 minutes
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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.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners explore the different salinities of various sources of water by taste-testing.

$1 - $5 per group Ages 6 - 14 10 to 30 minutes
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Learners follow a three-step process to start their own rock collection.

$1 - $5 per student Ages 8 - 14 1 to 7 days
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Some aquatic organisms live in open water, while some live in soil at the bottom of a body of water.

$1 - $5 per group Ages 6 - adult 30 to 45 minutes
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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.

$1 - $5 per group Ages 6 - 14 10 to 30 minutes
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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.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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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.

$1 - $5 per group Ages 6 - 14 Under 5 minutes
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In this collecting/comparing activity, learners work with samples of sand from different places like a lakefront, river, or ocean beach.

$1 - $5 per group Ages 4 - 14 30 to 45 minutes
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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.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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In this environmental education demonstration (page 6 of the PDF), learners will see a tangible representation of the scarcity of soil resources on earth.

$1 - $5 per group Ages 8 - 11 10 to 30 minutes
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Did you know that a Slinky makes a handy model of earthquake waves?

$1 - $5 per group Ages 8 - 18 10 to 30 minutes
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In this activity, learners create models of erosion and floods and learn to recognize both in their environment.

$1 - $5 per group Ages 8 - 18 45 to 60 minutes
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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.

$1 - $5 per student Ages 8 - 14 5 to 10 minutes
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In this engineering activity, learners build a device (an anemometer) to measure how fast the wind is blowing.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners explore the human influences on the carbon cycle and examine how fossil fuels release carbon.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this group activity, learners use some common objects and work together to simulate the Coriolis effect. During the challenge, learners make predictions and test different scenarios.

$1 - $5 per group Ages 11 - 18 30 to 45 minutes
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In this activity, learners turn empty 2-liter bottles into a see-through compost container.

$1 - $5 per student Ages 4 - 14 1 to 12 months
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In this creative roleplay activity, learners will explore the various processes of the water cycle using movement, sound, and props to aid in comprehension.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes