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Politics : Formerly About Advanced Micro Devices
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To: Wharf Rat who wrote (1409374)7/4/2023 6:05:39 PM
From: maceng2  Read Replies (1) of 1576894
 
OK, I might be out by 25 ppm. It was a rough guesstimate.

During the "Snowball Earth" period, it is theorised that the only thing that kept life alive on Earth was the deep under sea volcanic vents that sustained a life support environment.

Up on the surface, everything was toast ... or rather icicles.

Snowball Earth - an overview | ScienceDirect Topics

<<According to the snowball Earth hypothesis, for a long period of time, extending from 720 to about 630 Mya, the Neoproterozoic Earth experienced a freezing period during which a thick layer of ice covered oceans and separated the Earth’s atmosphere from the ocean>>.
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