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Earth's Change from Ice Ball to Warm Planet Was Sudden

A long, long time ago there was a supercontinent on the planet Earth called Rodinia. The continent broke up and gigantic rivers flowed across its landscape. Consequently, the chemistry of the sea was changed.
Iceage planet earth rodinia
High CO2 levels in the atmosphere fell. Heat was no longer trapped by the greenhouse effect. A very long iceage began with temperatures falling to -50°C. The iceage went on for a long time because the now white planet reflected the sun's energy.

Time stood still for rocks. Weathering did not occur. Volcanic activity began but it did not increase C02 by very much. Sea ice stopped sea water from taking up CO2 as it continued to reflect heat away.

Some explosive activity must have happened: the change from iceage to greenhouse was sudden. glassy hyaloclastite fell into the ocean releasing phosphorus. This released oxygen into the ocean and the atmosphere. Cataclysms destroy life so life can begin anew.
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