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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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Earth ScienceHistory of Earth's Atmosphere II
The composition of Earth’s atmosphere has evolved over time. This module examines how Earth came...
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BiologyPaleontology and the Fossil Record
Paleontologists study fossils to understand ancient organisms. While fossils might look simple enough, they provide...
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