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Learners will compare the growth rate and appearance of crystals forming on small rocks to those growing on miscellaneous objects. Learners will also investigate how temperature (warm vs.

In this activity, learners touch supercooled water drops with an ice crystal and trigger the water drops to freeze instantly.

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.

In this activity, learners observe a quick phase change as water rapidly goes from a liquid state to a solid state.

In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.

In this chemistry activity (page 1 of the PDF), learners will observe a physical change.

Learners explore the variables that affect the properties of ice and the places where different types of ice are found.