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Earth ScienceOrigins of Plate Tectonic Theory
The theory of continental drift was the first step toward plate tectonic theory, which became...
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ChemistryChemical Equations
Chemical equations are an efficient way to describe chemical reactions. This module explains the shorthand...
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ChemistryThe Periodic Table of Elements I
The modern periodic table is based on Dmitri Mendeleev’s 1896 observations that chemical elements can...
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