Earth core

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Pecore, J. L., Christensen, B. A., Mobley, H., & Hanna, N. R. (2007). Earth core: Enhancing delivery of geoscience content in a diverse school system during times of changing state standards. Journal of Geoscience Education, 55(6), 589-595. doi:10.5408/1089-9995-55.6.589
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