Easy to forget how much more land there is north of the equator compared to the south (68% vs 32% of total landmass!) http://phl.upr.edu/library/notes/distributionoflandmassesofthepaleo-earth …pic.twitter.com/9EsB7yZCtQ
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88/68 = ~30% gives u a simplistic ratio which broadly answers the (second) q. The first q and the calc that entails would be interesting to look at.
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