19 October, 2020

Ice Ages

Ice Ages

We are in the midst of an ice age. The reason we still survive is that fortunately an ice age, which can last for a period between tens of millions to hundreds of millions of years, alternates between glacial and interglacial periods. During the glacial phase, the ice sheets advance, as they retreat during the interglacial one. According to www.universetoday.com, “The Earth is currently in an interglacial period, and the last glacial period ended about 100,000 years ago. What remains of the continental ice sheets that once stretched across the globe are now restricted to Greenland and Antarctica, as well as smaller glaciers — like the one that covers Baffin Island.”

In our planet’s history, we have witnessed five ice ages. The first one lasted 2.4-2.1 billion years ago, and evidence was found around Lake Huron. The second one, 850-630 million years ago, was “perhaps the most severe.” According to the website, “It is believed that during this period, the glacial ice sheets reached the equator, thus leading to a ‘Snowball...



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