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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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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 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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Millions of organisms can live in and around a body of water.

1 cent - $1 per student Ages 8 - adult 45 to 60 minutes
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In this outdoor activity, learners search for the warmest and coolest, windiest and calmest, wettest and driest, and brightest and darkest spots in an area.

$10 - $20 per group Ages 8 - 18 45 to 60 minutes
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In this outdoor activity, learners compare the moisture released from different kinds of leaves and from different parts of the same leaf, by observing the color change of cobalt chloride paper.

$10 - $20 per group Ages 8 - 18 45 to 60 minutes
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In this outdoor activity, learners investigate spider webs and feeding behavior, particularly how spiders trap food in their sticky silk webs while not getting stuck themselves.

$5 - $10 per group Ages 6 - 18 45 to 60 minutes
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This activity has learners interacting with live crayfish, but could be adapted for a variety of similar hardy and interesting organisms.

Over $20 per group Ages 4 - adult 10 to 30 minutes
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In this set of outdoor games, learners play the role of monkeys that are trying to get enough resources (food, shelter, and space) to survive.

Over $20 per group Ages 8 - 18 45 to 60 minutes
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Just like birds, some dinosaurs had air-filled (pneumatic) bones, which made the dinosaurs' skeletons lighter.

$1 - $5 Ages 8 - 18 1 to 7 days
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Although we may not admit it, all humans fart or pass some gas. In this activity, learners make their own model to mimic food passing through intestines and discover what releases gas.

$1 - $5 per group Ages 8 - adult 10 to 30 minutes
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In this outdoor activity, learners make their own organic-rich soil. Depending on where this activity is done, learners will probably discover that their local soil is low in organic matter.

$10 - $20 per group Ages 8 - 18 45 to 60 minutes
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In this fun sticker activity, learners will create a size wheel with images of objects of different size, from macroscopic scale (like an ant) to nanoscale (like DNA).

1 cent - $1 per student Ages 6 - 18 10 to 30 minutes
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Lakes, streams and other freshwater bodies are a habitat for lots of living things, big and small.

$10 - $20 per group Ages 8 - adult 10 to 30 minutes
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Many germs spread by our hands, and often times, people don't wash their hands well enough to get rid of germs.

$1 - $5 per group Ages 6 - adult 5 to 10 minutes
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Glare from the sun and ripples from the wind can make it hard to see what's below the surface of a body of water.

$5 - $10 per group Ages 6 - adult 10 to 30 minutes
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In this outdoor activity/field trip, learners conduct experiments to explore where dragonflies and damselflies perch or rest, and how the flies change behavior in reaction to other flies or fly decoys

$5 - $10 per group Ages 6 - 18 45 to 60 minutes
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In this outdoor mapping activity, learners explore where plants grow and map plant-distribution patterns.

$5 - $10 per group Ages 8 - 18 45 to 60 minutes
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In this outdoor activity/game, learners use thermometers to simulate how lizards survive in habitats with extreme temperatures.

$5 - $10 per group Ages 8 - 18 45 to 60 minutes