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Animations
- Stephen Marshak, University of Illinois, Urbana
Champaign, with Precision Graphics
- Declan DePaor, Boston University and ScienceProf.com
Overviews, Self-Tests and Crossword Puzzles
- Rita Leafgren, University of Northern Colorado
Earth Science News updates and archives
Feature Articles
- Stephen Marshak
- Betsy L. Mason
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