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ChemistryThe Periodic Table of Elements II
This module traces the history of the periodic table of the elements. In the mid-1800s,...
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Earth ScienceFactors that Control Earth's Temperature
Based on how much sunlight hits Earth versus how much is reflected, Earth’s average temperature...
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ChemistryProperties of Solids
Solids are formed when the forces holding atoms or molecules together are stronger than the...
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