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The Snowball Earth is a geohistorical hypothesis that proposes that during one or more of Earth's icehouse climates, the planet's surface became nearly entirely frozen with no liquid oceanic or surface water exposed to the atmosphere.
There were three (or possibly four) significant ice ages during the late Neoproterozoic. These periods of nearly complete glaciation of Earth are often referred to as "Snowball Earth", where it is hypothesized that at times the planet was covered by ice 1–2 km (0.62–1.24 mi) thick. [14]
After the long environmental stability/stagnation during the Boring Billion, the Sturtian glaciation began at the beginning of Cryogenian, freezing the entire planet in a state of severe icehouse climate known as a snowball Earth. After 70 million years it ended, but was quickly followed by another global ice age, the Marinoan glaciation.
Snowball Earth—a nickname that refers to the way our planet must have looked from space at the time—was the reality of our planet during two major ancient freezes. And now, researchers may ...
Scientists have identified Earth's oldest-known impact crater, and in doing so may have solved a mystery about how our planet emerged from one of its most dire periods. Researchers have determined ...
The third ice age, and possibly most severe, is estimated to have occurred from 720 to 635 Ma (million years) ago, [3] in the Neoproterozoic Era, and it has been suggested that it produced a second [4] "Snowball Earth", i.e. a period during which Earth was completely covered in ice.
The Port Askaig Formation, which is made up of layers of rock up to 1.1km thick, was likely laid down between 662 and 720 million years ago.
One of the most severe glaciation event known in the geologic record occurred during the Cryogenian period of the Neoproterozoic, when global ice sheets may have reached the equator and created a "Snowball Earth" lasting about 100 million years.