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    WGBH
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    In this tasty activity, learners make their own ice cream any day of the year in an exploration of heat and cold. Highlights include freezing and melting and the transition from liquid to solid....

    $1 - $5 per student Ages 6 - 11 45 to 60 minutes
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    BBC
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    In this online activity, learners use reversible and irreversible changes to save the Crystal of St Helena from SKUL! Learners discover whether processes like freezing, sieving, and dissolving are...

    free Ages 8 - 14 5 to 10 minutes
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    Colorado State University
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    In this demonstration, learners observe how liquid nitrogen both boils and freezes ingredients to make ice cream in two minutes. The liquid nitrogen also causes the fat and water particles to stay...

    $10 - $20 per group Ages 6 - 14 Under 5 minutes
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    American Chemical Society
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    What causes frost to form on the outside of a cold container? In this activity, learners discover that liquid water can change states and freeze to become ice. This can be used as a follow-up...

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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    Lawrence Hall of Science
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    In this outdoor, winter activity, learners find living green plants under the snow and determine the light and temperature conditions around the plants. Then, they find out how the snow layer...

    Over $20 per group Ages 8 - 18 30 to 45 minutes
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    Lawrence Hall of Science
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    In this outdoor winter activity, learners search for and create hibernation sites that will protect gelatin "animals" from freezing. Learners come to understand that hibernating animals...

    $1 - $5 per group Ages 6 - 14 45 to 60 minutes