Guffey, Sarah K, Stephanie J Slater, Sharon p Schleigh, Timothy F Slater, and Inge Heyer. “Surveying Geology Concepts In Education Standards For A Rapidly Changing Global Context”. Contemporary Issues in Education Research (CIER) 9, no. 4 (October 3, 2016): 167–188. Accessed July 17, 2024. https://clutejournals.com/index.php/CIER/article/view/9788.