One geologist thinks Earth has been banged up a bit more than previously thought -- never allowing the 'Snowball Earth' global ice age to develop.
via Discovery News http://news.discovery.com/earth/weather-extreme-events/how-many-mega-impacts-have-whacked-earth-131015.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/weather-extreme-events/how-many-mega-impacts-have-whacked-earth-131015.htm#mkcpgn=rssnws1
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