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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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ChemistryWater
Water is a truly unusual and important substance. The unique chemical properties of water that...
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Earth ScienceNatural Hazards and Risk
Tornadoes, earthquakes, tsunamis, and volcanic activity are all examples of natural hazards with the potential...
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