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Background Information

1. Identify the sun as the major source of energy for the earth. Emphasize that it provides the energy needed to generate the wind and weather.

2. Compare and contrast air masses. Explain what happens when they pass over an area.

3. Demonstrate the presence of humidity in the atmosphere. Humidity is the amount of water vapor in the atmosphere.

Introduce this concept by asking what happens to the mirror during a hot bath or shower.
To demonstrate this concept, fill a glass with water and ice. Add a few drops of food coloring. The purpose of adding food coloring is to prove that the condensation which occurs is moisture from the atmosphere and not from the cup. Let it stand for a few minutes. Have students observe and discuss what happens.

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