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[Phys-L] snowball Earth

While I was discussing the Hubble Law and expansion of the universe today
in my astronomy class, a student (senior) asked me an unrelated question
about the snowball Earth idea - that the Earth's surface was completely
frozen in the past, much more than a typical "ice age." How could this
happen? Is there any strong evidence for this? Does anyone teach this idea
or know of good research/papers (appropriate for high school kids)?



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