The researchers do admit that ‘Snowball Earth is just a hypothesis’, but that period seems to have been an era of the most extreme long-term cold spell(s) ever detected on Earth.
There is very little life in Arctic tundras and glaciers. However that was the situation in a big portion of the world during Ice Ages, says Technology.org.
How did life survive these difficult periods? How didn’t everything just die, being cut off from any kind of sources of nutrition and oxygen?
Scientists examined the chemistry of the iron formations in Australia, Namibia, and California to get a window into the environmental conditions during the ice age. They selected rocks left there by the ice age, because they are representative of the conditions during that difficult period for life.
By analysing these rocks scientists from the McGill University were able to estimate the amount of oxygen in the…
View original post 219 more words