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Under Construction. * Physics Physics Elementary Particles Particle Physics Astronomy Universe Solar System Planets Sky Maps Astronomical Events Ecliplses Solar Flares & Sun Spots Near-Earth Objects - Asteroids and Comets Light Sound Sound Light & Color Radio Electromagnetic Spectrum * Chemistry General Chemistry here * Geology Earth History Earthquakes | Volcanoes | Tsunamis | * Weather Hurricanes | Tornadoes Volcanoes | Tsunamis * Biology General Mass Extinctions health/germs (Bacteria, Viruses, Parasites - Protozoans, Fungi) * Other Inventions Size Famous Scientists Books: The New York Public Library Science Desk Reference, 1995, Ed. Patricia Barnes-Svarney |