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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 ScienceThe Phosphorus Cycle
All living organisms need phosphorous to survive and grow. This module describes forms that phosphorous...
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Process of ScienceTheories, Hypotheses, and Laws
Theories are not based on one scientist's work but on an accumulation of evidence and...
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