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In this activity, learners use gumdrops and toothpicks to model the composition and molecular structure of three greenhouse gases: carbon dioxide (CO2), water vapor (H2O) and methane (CH4).

$1 - $5 per group Ages 6 - 14 10 to 30 minutes
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In this activity, learners will be introduced to biomass gasification and will generate their own biomass gases.

Over $20 per group Ages 14 - 18 2 to 4 hours
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In this activity, learners calculate the number of milliliters of water a nearby tree transpires per day.

$1 - $5 per group Ages 14 - 18 4 to 24 hours
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In this activity, learners will create their very own constellation.

1 cent - $1 per student Ages 4 - 14 5 to 10 minutes
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In this activity, learners make water-walking critters using thin wire, and then test how many paper clips these critters can carry without sinking.

$5 - $10 per group Ages 11 - 14 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 activity, learners create volcanoes like those they have examined on Earth and Mars through images taken by spacecraft.

$10 - $20 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners identify the reproductive parts of plants and the animal (bee) structures involved in pollination.

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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In this activity, learners will measure the length of their shadow from the Sun and compare it three to four months later.

free Ages 6 - 14 1 to 12 months
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In this weather forecasting activity, learners determine the location of cold and warm fronts on weather plot maps.

free Ages 8 - 18 45 to 60 minutes
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In this activity with several mini experiments, learners explore the chemistry that helps scientists learn about the environment and how they can help save it.

$1 - $5 per group Ages 8 - 14 4 to 24 hours
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In this activity (on pages 29-35), learners examine water pollution and filtration.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this very hands-on lesson, learners will investigate dendrochronology (the study of tree rings to answer ecological questions about the recent past) and come up with conclusions as to what possible

1 cent - $1 per group Ages 8 - 14 2 to 4 hours
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Agriculturalists have long considered mushroom growing a challenge, largely because you need a piece of benchtop equipment known as a laminar flow hood.

Over $20 per group Ages 11 - adult 1 to 4 weeks
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This activity (on pages 15-23) combines interactive role-playing and graphing to introduce learners to the health affects of pollen.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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This experiment is designed to illustrate how fluids, including water, have the ability to flow.

1 cent - $1 per group Ages 11 - 18 45 to 60 minutes
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In this activity, learners experience firsthand how marine animals' adaptive coloration camouflages them from prey.

$1 - $5 per group Ages 14 - 18 45 to 60 minutes
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In this outdoor activity/field trip, learners explore an aquatic site such as a pond, lake, stream, river or seashore to find and investigate plants and animals that live in water.

$5 - $10 per group Ages 6 - 11 1 to 2 hours
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In this activity, learners test exhaled breath for carbon dioxide and learn how to use an indicator as a simple way to measure pH.

$5 - $10 per student Ages 8 - 18 10 to 30 minutes
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In this activity, learners discover how landfills affect the natural environment.

free Ages 8 - 18 1 to 4 weeks