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NASA's Sun-Earth Connections Education Forum is a good first stop, with links to NASA's Sun-Earth missions, cool imagery sets, a self-help reference desk, and much more.
NASA's Spacelink site offers a comprehensive search engine.
Click here to download Living with a Star, NASA's educator guide. The grade-specific Web resources are for middle and high school, but the general information links are likely to answer your content questions.s
NASA's Space Science Education Resource Directory provides "a convenient way to find NASA space science products for use in classrooms, science museums," etc.; including grade-level-specific queries.
All about the sunspot cycle, including daily sunspot numbers and historical records. Some graphics require Java support.
Sunspot cycle graphing activity for students from Windows to the Universe, with data from 1700 to 1999.
How to make your own sunspotter (I hope you or someone you know is handy....)
As the Sun Burns includes curricula and UV-bead activities for grades 2-4, 5-8, and 9-12.
You & Me & UV features UV-bead activities directed at grades 5-8.
Get a free EM spectrum poster (plus other cool posters) from the Wright Center at Tufts University.
Eye-catching, fun-to-use EM spectrum pages from Amazing-Space; students will love "Toast the Robot."
The Ozone Hole Movie -- Satellite data from 1978 to the present, presented as a movie consisting of successive monthly views of total ozone. An easy way to play with this movie: Just run it by clicking "Build Animation," then drag the slider bar to compare the same month of specific years. The most revealing month is October, when polar ozone is at a minimum. Compare, for example, Oct 79, Oct 82, Oct 91, and Oct 2000.
How Ozone Destruction Works -- A clearly depicted animation with clearly written accompanying text.
The Ozone Hole Tour -- More than you may need or want to know, much of this technically accurate but reader-friendly site should be accessible to high-school students.
Adler Planetarium (Chicago) has posted a Lesson Plan Database that includes 36 teacher-authored and -tested lesson plans, mostly for grades 4-6 (and up), plus a couple for K-3. Use the word all for both the login and password).
Lesson plans and activities from Windows to the Universe.
Lesson plans and activites from UC-Berkeley's Space Sciences Lab.
Stanford Solar Center -- Featuring lessons, activities, information, ask-a-solar-astronomer, helioseismology, and more.
SpaceShots -- your "one-stop space shop" for maps and posters (fairly reasonably priced)
Plasma - the Fourth State of Matter -- A lucid explanation of plasma and why scientists study it.