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ChemistryEarly Ideas about Matter
Tracking the development of our understanding of the atomic structure of matter, this module begins...
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Math in ScienceScientific Notation
The blue whale weighs approximately 190,000 kilograms, while a plankton weighs just 0.5 milligrams—a difference...
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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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