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In this activity, learners explore the concept of permeability to better understand why amphibians are extremely sensitive to pollution.

1 cent - $1 per group Ages 4 - 14 4 to 24 hours
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In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

1 cent - $1 per group Ages 6 - 14 30 to 45 minutes
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Many people get water from a source deep underground, called groundwater.

$10 - $20 per group Ages 6 - adult 10 to 30 minutes
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By building a simple watershed with paper and markers and then using a spray bottle to simulate precipitation, learners will understand how pollution accumulates in our water sources, especially from

1 cent - $1 per group Ages 6 - 14 10 to 30 minutes
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Learners investigate the properties of the liquids in two bottles. One contains layers of oil and water, and one contains oil, water, and soap.

$1 - $5 per group Ages 4 - 14 10 to 30 minutes
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Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

$10 - $20 per group Ages 6 - adult 10 to 30 minutes
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In this environmental science activity (page 4 of the PDF), learners use vinegar and chalk to observe the effect of acid rain on various building materials and plant life.

$1 - $5 per group Ages 6 - 14 4 to 24 hours
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In this design challenge, learners design a storm drain cover that catches litter to protect waterways to learn about how local actions can have system-level effects.

$5 - $10 per student Ages 6 - 14 45 to 60 minutes
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In this activity (on page 2 of the PDF), learners explore surface tension by adding pennies to cups which are "full" of plain water or soapy water.

1 cent - $1 per student Ages 6 - 14 5 to 10 minutes