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Date: 2010-11-16 21:45:55Doomsday scenarios Planetary science Lunar science Extinction events Impact event Near-Earth object Asteroid 99942 Apophis Impact crater Tunguska event Meteorite International Year of Planet Earth | NORTHERN CALIFORNIA GEOLOGICAL SOCIETY Website: www.ncgeolsoc.org NCGS OFFICERS President:Add to Reading ListSource URL: www.ncgeolsoc.orgDownload Document from Source WebsiteFile Size: 44,17 KBShare Document on Facebook |