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    University of Illinois Extension
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    In this activity, learners investigate soil conditions by creating a soil map. Learners record soil characteristics and compare the conditions of soil in different grid sections. Use this activity...

    1 cent - $1 per student Ages 4 - 14 1 to 2 hours
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    NASA
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    In this activity, learners discover that one way to cool an object in the presence of a heat source is to increase the distance from it or change the angle at which it is faced. Learners perform an...

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    New England Aquarium
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    In this activity, learners explore how salt water freezes in comparison to fresh water. Use this experiment to consider how pond animals survive cold winters in comparison to animals that live in...

    1 cent - $1 per group Ages 6 - 14 1 to 2 hours
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    New York Hall of Science
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    In this inquiry-based lesson, learners measure the biomass of trees, calculate the carbon stored by the trees, and use this information to create recommendations about using trees for carbon...

    1 cent - $1 per student Ages 11 - 14 1 to 2 hours
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    NOAA
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    In this activity, learners discover if carbon dioxide has an effect on temperature. Learners compare the temperatures of two bottles filled with water, one with seltzer tablets and one without,...

    1 cent - $1 per group Ages 6 - 14 1 to 2 hours