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I'm working on a weather unit for 5th grade so I've listed several SmartBoard links below for lessons that would work well with this unit.
The Water Cycle: Good overview. Really like the run-off section.
Weather: Excellent information on fronts and air masses. Great graphics.
Weather Clouds: Great graphic of the Earth with explanation of humidity.
Virginia Weather Lesson: Developed for Virginia students, this lesson has a terrific Venn diagram activity for the four cloud types (cumulus, cumulonimbus, cirrus, stratus).
If you have access to United Streaming, there are Weather Smart videos and check out the first 12 minutes of the Magic School Bus video, Wet All Over, which gives an entertaining overview of the water cycle.