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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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This outdoor activity/field trip requires a place where minnows swim, such as a local pond or brook.

$5 - $10 per group Ages 8 - 14 45 to 60 minutes
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Investigate a flower's power of marketing by making an imitation flower that successfully signals a bee (or other pollinator of your choice) to visit.

1 cent - $1 per student Ages 4 - 11 5 to 10 minutes
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In this multi-part activity learners examine non-point water pollution.

free Ages 6 - adult
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This activity (located on page 3 of the PDF under GPS: Cave Swallows Activity) is a full inquiry investigation into bird behaviors.

free Ages 8 - 14 2 to 4 hours
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In this activity, learners will simulate the interactions between a predator population of gray wolves and a prey population of deer in a forest.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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Dig a hole, line it, fill it with fresh water, and you have a water hole: a good place to study colonization.

$5 - $10 per group Ages 8 - 18 1 to 12 months
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Plants need nutrients to grow. This is why we apply fertilizers to grass and food crops. In this activity, learners will explore how fertilizers can affect lakes and other bodies of water.

$5 - $10 per group Ages 8 - adult 1 to 4 weeks
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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 environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth.

$5 - $10 per group Ages 14 - 18 1 to 2 hours
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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 outdoor activity, learners investigate the relationship between the slope of a trail and soil erosion.

$10 - $20 per group Ages 8 - 18 45 to 60 minutes
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In this outdoor activity, learners search for lichen, a combination of a fungus and an alga living together. Lichen grow where most other plants cannot, on rocks, the trunks of trees, logs and sand.

$10 - $20 per group Ages 8 - 18 1 to 2 hours
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In this arts and crafts activity about animals and animal characteristics, learners will design animal hats and role-play as animals.

$5 - $10 per group Ages 4 - 6 10 to 30 minutes
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In this family or group inquiry activity, learners use their senses to explore a local forest or woodland.

1 cent - $1 per group Ages 6 - 11 1 to 2 hours
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In this outdoor beach activity, learners use a variety of "beaks" (such as trowels, spoons or sticks) to hunt for organisms that shore birds might eat.

$5 - $10 per group Ages 8 - 14 45 to 60 minutes
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This is an activity which will allow learners to gain an understanding of lemur behavior through observation and role play.

free Ages 6 - 14 10 to 30 minutes
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In this online Flash game, learners will explore a coral reef using an underwater remotely operated vehicle (ROV).

free Ages 6 - 14 5 to 10 minutes
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In this outdoor, night activity, learners track nocturnal animals' footprints, droppings and other signs of their presence.

Over $20 per group Ages 6 - 14 1 to 7 days
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In this outdoor activity, learners find, count and compare as many different kinds of animals as they can find in two different areas: a managed lawn and a weedy area.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes