Around 700 million years ago, the world is thought to have experienced its most severe ice age -- a period evocatively described by scientists as Snowball Earth.
It threatened the survival of much of the planet's primitive living things, like oxygen-dependent marine life -- including the earliest animals, such as simple sponges.Something crashed into Earth and helped wipe out mammoths and other animals 13,000 years ago, study says But new geological evidence uncovered by scientists at McGill University in Montreal has found that glacial meltwater provided a crucial lifeline at the time to microscopic organisms known as eukaryotes.
Read MoreLechte, who is also a postdoctoral researcher in the Department of Earth and Planetary Sciences at McGill University, said that air bubbles trapped in the glacial ice were released into the water as it melts, enriching it with oxygen, a process he described as a"glacial oxygen pump.
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