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States of matter  
Learning Time:
45 to 60 minutes  
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In this activity, students face an engineering challenge based on real-world applications. They are tasked with developing a tool they can use to measure the amount of rain that falls each day. Students will find out why freshwater is important,... (View More)

In this activity, students model the water cycle using a set of glass bowls, water, salt, clear plastic wrap, and a marble. and observe the process of evaporation, condensation, and precipitation. They observe that water can change from a liquid to... (View More)

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