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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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Create 3D glasses and use them to explore color, light and optics. Fool your brain into 'seeing' three dimensions on a flat surface!

1 cent - $1 per student Ages 6 - 18 10 to 30 minutes
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Learners take on the role of environmental engineers as they design water filters.

$5 - $10 per group Ages 11 - 14 45 to 60 minutes
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In this activity, learners simulate nature's water filtration system by devising a system that will filter out both visible and invisible pollutants from water.

$5 - $10 per group Ages 8 - 18 1 to 2 hours
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"Exploring the Universe: Filtered Light" demonstrates how scientists can use telescopes and other tools to capture and filter different energies of light to study the universe.

1 cent - $1 per student Ages 6 - 14 5 to 10 minutes
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In this quick activity (located on page 2 of the PDF under GPS Wetlands Activity), learners will model how wetlands act as natural filters for the environment.

$5 - $10 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners explore how engineering has developed various means to remove impurities from water.

$10 - $20 per group Ages 8 - 18 1 to 2 hours
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How many colors make black? Gather as many water soluble black markers as you can find.

1 cent - $1 per student Ages 4 - 18 10 to 30 minutes
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Learners analyze mixtures of dyes using filter paper chromatography. They place spots of the different dyes at the bottom of a piece of filter paper, and hang the paper to touch the surface of water.

$1 - $5 per group Ages 8 - adult Under 5 minutes
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Make a quick and easy filter from household materials. A filter will catch any solids suspended in a liquid and filter them out. By using a filter, learners can discover amazing things.

1 cent - $1 per student Ages 4 - 8 5 to 10 minutes
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In this four-part activity, learners explore light and sound through a variety of hands-on investigations.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners interact with whale artifacts such as replicas of skulls, bones, teeth, and baleen (hair-like plates that form a feeding filter).

Over $20 per group Ages 4 - adult 10 to 30 minutes
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In this activity, learners use gelatin as a lens to investigate the properties of laser light.

$5 - $10 per student Ages 8 - 18 5 to 10 minutes
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Learners observe and discuss a vacuum cleaner as a model of a baghouse, a device used in cleaning industrial air pollution.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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Water treatment on a large scale enables the supply of clean drinking water to communities.

$5 - $10 per group Ages 11 - adult 45 to 60 minutes
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In this ecology activity (page 8 of the PDF), learners explore how to filter contaminated water using a variety of materials.

$10 - $20 per group Ages 11 - 14 45 to 60 minutes