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In this activity (page 7 of pdf), learners research tide pool ecosystems, and then create brochures that "advertise" these environments.

1 cent - $1 per student Ages 8 - 11 2 to 4 hours
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Learners blow into balloons and collect their breath--carbon dioxide gas (CO2). They then blow the CO2 from the balloon into a solution of acid-base indicator.

$1 - $5 per student Ages 8 - 14 5 to 10 minutes
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In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners compare and contrast their own skin (including the area covered) with that of an orange.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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Learners build a model of a pollution control device--a cyclone. A cyclone works by whirling the polluted air in a circle and accumulating particles on the edges of the container.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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In this investigation learners explore the differences between, and interdependence of, living and nonliving elements in a water ecosystem.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this two-part outdoor activity, learners conduct a population census of squirting clams on a beach or mudflat, and investigate the clams' natural history.

$5 - $10 per group Ages 8 - adult 1 to 2 hours
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This lesson familiarizes learners with the term "tropical belt." First, learners locate the equator, Tropic of Cancer and Tropic of Capricorn on a map and trace these lines with a crayon.

$1 - $5 per group Ages 4 - 11 45 to 60 minutes
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In this data analysis activity, learners use data collected by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) to study Chilean sea bass populations.

$1 - $5 per student Ages 14 - 18 1 to 2 hours
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Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

$1 - $5 per group Ages 8 - 18 10 to 30 minutes
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In this activity, students will learn some key information about a San Francisco native animal and then write a firsthand account of their experience from the perspective of that animal in the time be

free Ages 8 - 11 30 to 45 minutes
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This activity attempts to clear up the common misconception that deserts are always hot, totally dry, and uninhabitable.

$1 - $5 per group Ages 4 - 11 30 to 45 minutes
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In this activity, learners role-play the part of lake inhabitants and the aquatic exotics who displace the native species.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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In this activity on page 7 of the PDF, learners investigate the solubility of gas in water at different temperatures. This experiment will help learners determine if temperature affects solubility.

$1 - $5 per student Ages 8 - 14 45 to 60 minutes
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This activity provides a hands-on experience with a scale model, a relatively high viscosity fluid, and feeding behaviors.

$5 - $10 per group Ages 8 - 18 30 to 45 minutes
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In this activity (on page 1), learners role play as atoms to explore how atoms can be rearranged to make different materials.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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In this 7-10 day investigation, learners develop an understanding of waves and tides and their motion through discussion, demonstration, and hands-on activities.

$1 - $5 per group Ages 11 - 14 1 to 4 weeks
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This activity (located on page 3 of the PDF under GPS: Temperate Rain Forest Activity) is a full inquiry investigation into tree growth rates.

$10 - $20 per group Ages 8 - 14 45 to 60 minutes
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This activity (located on page 3 of the PDF under GPS: Temperate Rain Forest Activity) is a full inquiry investigation into biodiversity of a given habitat.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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Learners build particulate matter collectors--devices that collect samples of visible particulates present in polluted air.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes