Editing Snowball Earth (section)

==External links==
* [https://web.archive.org/web/20100613140722/http://studentresearch.wcp.muohio.edu/snowballearth/articles/Snowballearthpast99.pdf The Snowball Earth] 1999 overview by Paul F. Hoffman and [[Daniel P. Schrag]], 8 August 1999
* [http://www.snowballearth.org/index.html Snowball Earth web site] Exhaustive on-line resource for snowball Earth by pro-snowball scientists Hoffman and Schrag.
* [https://www.sciencedaily.com/releases/2007/03/070323104746.htm New Evidence Puts 'Snowball Earth' Theory Out In The Cold] sciencedaily.com. 2007. Analyses in Oman produce evidence of hot-cold cycles in the Cryogenian period, roughly 850–544 million years ago. The UK-Swiss team claims that this evidence undermines hypotheses of an ice age so severe that Earth's oceans completely froze over.
* [http://www.channel4.com/programmes/catastrophe/4od#2917637 Channel 4 (UK) documentary, Catastrophe: Snowball Earth] {{Webarchive|url=https://web.archive.org/web/20160529143900/http://www.channel4.com/programmes/catastrophe/4od#2917637 |date=29 May 2016 }} episode 2 of 5, first screened Dec 2008, documentary narrated by [[Tony Robinson]], advocates snowball Earth and contains interviews with proponents.
* [https://www.newscientist.com/article/mg20527461.100-first-breath-earths-billionyear-struggle-for-oxygen.html First breath: Earth's billion-year struggle for oxygen] [[New Scientist]], #2746, 5 February 2010 by Nick Lane. Posits an earlier much longer snowball period, c. 2.4 – c. 2.0 Gya, triggered by the [[Great Oxygenation Event]].
* [http://news.bbc.co.uk/2/hi/uk_news/scotland/1857545.stm 'Snowball Earth' theory melted] [[BBC News online]] (2002-03-06) report on findings by geoscientists at the [[University of St Andrews]], Scotland that casts doubt on the snowball Earth hypothesis due to evidence of sedimentary material, which could only have been derived from floating ice on open oceanic waters.
* [https://www.bbc.co.uk/news/science-environment-11992299 Life may have survived 'snowball Earth' in ocean pockets] [[BBC News online]] (2010-12-14) report on research presented in the journal [[Geology (journal)|Geology]] by Dr Dan Le Heron (''et al.'') of [[Royal Holloway, University of London]] who studied rock formations in Flinders Ranges in South Australia, formed from sediments dating to the Sturtian glaciation, which bear the unmistakable mark of turbulent oceans.
* [https://www.giss.nasa.gov/research/briefs/2002_sohl_01/ Snowball Earth animated simulation] by [[NASA]] and [[Lamont–Doherty Earth Observatory|LDEO]] 

{{Greenhouse and Icehouse Earth}}
{{Ice ages}}

[[Category:Ice ages]]
[[Category:Cryogenian]]
[[Category:Extinction events]]
[[Category:Proterozoic]]
[[Category:Paleoclimatology]]
[[Category:Hypotheses]]
[[Category:Meteorological hypotheses]]
[[Category:Water ice]]