The Water Cycle By Erin Cole 11/2/09

The Phases of Water Liquid Frozen Solid Gas There are three phases of water: liquid, solid, and gas. When we normally think of water, we think of liquid. However, water can also be a solid, such as a frozen ice cube or a gas. Water in the form of gas makes up the clouds.

The Magic School Bus

What happened? LiquidGas GasRain RainFrozen Solid This slide is simply a review of what happened in the movie. Have students explain what happened and why (temperature, when, where, etc.)

Liquid to Solid Liquid Solid A liquid becomes a solid at very cold temperatures. In fact, liquid freezes at 32 degrees Farenheit. A solid liquid melts to return to liquid form. Ice cubes will begin to melt at any temperature higher than 32 degrees.

Liquid to Gas Evaporation Condensation Liquid becomes gas in two forms. It can condensate on the outside of a drinking glass. (Have you ever wondered why the outside of your glass gets wet on a hot day?) It can also evaporate. When liquid evaporates, it seems to simply disappear. Really, it becomes the clouds you see above you outside.

Gas to Liquid Rain Hail Snow When a cloud becomes to heavy with evaporated water, it pours the water back onto the earth. This is called precipitaion. There are two different types of precipitation: rain and snow. These changes as the weather changes. If it’s warm out, it rains. However, if it’s cold (32 degrees), the rain freezes and becomes snow. There is also a state between rain and snow which is called Hail. This is solid rain.

Summary The 3 forms of water Influenced by temperature Repeats constantly The three forms of water are liquid, solid, and gas. Temperature changes cause water to change forms. This process is ongoing, and often moves in a circular pattern, just like in the picture.

Review What are the three forms of water? How does a liquid become a solid? How does a liquid become a gas? How does a gas return to a liquid? If you were to draw the water cycle, what shape would it be in? Ask students to answer questions to assess what they’ve learned either out loud or on paper.

Answers to Review Liquid, Solid, Gas A liquid becomes a solid when it is colder than 32 degrees. A liquid becomes a gas through condensation and evaporation. Gas returns to liquid through rain, hail, and snow. The water cycle is a circle. These answers are not finite. They can be stated in different ways, but the idea should stay the same.