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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.

In this "Sid the Science Kid" activity from Episode 108: My Ice Pops, learners observe reversible change while thinking about ways to make ice melt.

In this activity, challenge learners to keep an ice cube from completely melting in 30 minutes. Learners engineer a box or wrap to prevent an ice cube from melting.

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.

In this outdoor water activity, learners explore evaporation by painting with water and tracing puddles. Learners will discover that wet things become dry as the water evaporates.

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

In this activity, learners thread colored beads onto string. Each beach represent a process of the water cycle.