The starting point is the four earth systems that combine our natural world: geosphere, hydrosphere, atmosphere and biosphere. The study of cycles organizes earth systems education: the rock cycle, the water cycle, the food chain, and the carbon cycle. page 2
http://www.ejmste.com/PreArt/EJMSTE_PreArt_Orion.pdf
A Holistic Approach for Science Education For All
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