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"It was the Cretaceous-Tertiary or the K-T Extinction." - Wrong

The K-T Extinction was the mass extinction that wiped out the dinosaurs, which was more widely believed to be caused by a heavenly body colliding with the Earth.

The mass extinction that involved a large period of glaciation was in truth the Ordovician-Silurian Extinction, which was the earliest mass extinction.

The extinction is associated with a period of glaciation. First, sea levels dropped as glaciers formed. Later, as the glaciers melted, the sea level rose. The cause of this glaciation remains a mystery. One suggestion is land plants caused it by absorbing large amounts of carbon dioxide from the atmosphere. The drop in carbon dioxide could then have caused global cooling.

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