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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. [13]
The Sturtian glaciation was a worldwide glaciation during the Cryogenian Period when the Earth experienced repeated large-scale glaciations. [ 2 ] [ 4 ] As of January 2023 [update] , the Sturtian glaciation is thought to have lasted from c. 717 Ma to c. 660 Ma, a time span of approximately 57 million years. [ 2 ]
Snowball Earth (Japanese: スノウボールアース, Hepburn: Sunoubōru Āsu) is a Japanese manga series written and illustrated by Yuhiro Tsujitsugu. It has been serialized in Shogakukan 's seinen manga magazine Monthly Big Comic Spirits since January 2021.
The Huronian glaciation (or Makganyene glaciation) [1] was a period where at least three ice ages occurred during the deposition of the Huronian Supergroup. Deposition of this largely sedimentary succession extended from approximately 2.5 to 2.2 billion years ago (), during the Siderian and Rhyacian periods of the Paleoproterozoic era.
The extension of the glaciation is not determined with certainty. [9] [8] Some authors argue that the glacial deposits were formed at low latitudes, below 30° N, [10] therefore close to the tropics, which would imply extensive glaciation, while others argue that the area was located at mid-latitude or even high latitude, closer to the pole, where a polar glacier could have formed, like the ...
The Earth is currently in such an interglacial period of the Quaternary glaciation, with the Last Glacial Period of the Quaternary having ended approximately 11,700 years ago. The current interglacial is known as the Holocene epoch. [ 1 ]
The nucleus of Comet Tempel 1.. The nucleus is the solid, central part of a comet, formerly termed a dirty snowball or an icy dirtball.A cometary nucleus is composed of rock, dust, and frozen gases.