s1.charset='UTF-8'; s1.setAttribute('crossorigin','*'); s0.parentNode.insertBefore(s1,s0); })(); Excerpt (p. 277-296) from: NGSS Lead States. (2012). A framework for K-12 science educati | blisspaper

Excerpt (p. 277-296) from: NGSS Lead States. (2012). A framework for K-12 science education: Practices, cross-cutting concepts, and core ideas. Arlington, VA: National Research Council.