The Four Earth Spheres
Geosphere, hydrosphere, atmosphere, biosphere — explained with real-world examples + a 5-question quiz. ~15 min.
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Open Lessons
A growing library of free, full-length K-12 STEAM lessons from EdTech Plus. Every page has been reviewed by teachers, includes a virtual lab or quiz, and is licensed under CC BY-NC 4.0 — share it with your class.
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