$1:
The Snowball Earth hypothesis is just that - a hypothesis - and while most agree on the evidence for a deep freeze, argument remains over the causes and the extent to which the entire globe froze during the Sturtian and Marinoan glaciations.
Some wonder how any life could have survived such a deep freeze.
How is this even plausible at all? Partial glaciation is one thing. But aside from the planetary orbit being moved another half-million kilometers away from the Sun (possibly dragged out of orbit by a passing super-dense celestial mass like a stellar core fragment, for example), what else would even cause a complete north-to-south global freezing? And if it occurred then how could it even naturally reverse itself without a massive increase in stellar activity from good ol' Sol?
I have major doubts on this one. This is veering dangerously close to Erich Von Daniken's tin-hatter territory.
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CKA Elite 
I don't play hochey.
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