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16 sie 2019 · The growth and decay of continental ice sheets have formed an integral part of the Earth’s climate system during the Late Cenozoic and particularly over the last 2.6 Ma (the Quaternary...
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Chętnie wyświetlilibyśmy opis, ale witryna, którą oglądasz,...
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Chętnie wyświetlilibyśmy opis, ale witryna, którą oglądasz,...
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Long before the Quaternary glaciation, land-based ice appeared and then disappeared during at least four other ice ages. The Quaternary glaciation can be considered a part of a Late Cenozoic Ice Age that began 33.9 Ma and is ongoing.
Past ice sheets have retreated rapidly, raising global sea level at rates >1 cm per year, with marine ice sheets collapsing and terrestrial ice sheets retreating in a more gradual fashion.
22 cze 2000 · While the Antarctic ice cap grew from the Oligocene (35 Myr), the Arctic ice cap became established about 2.4 Myr ago, the beginning of the Quaternary.
24 gru 2014 · In these special circumstances, a great cap of ice will form that refrigerates the enclosing waters, which then sink into the depths and gradually fill the ocean basins from below.
Quaternary, in the geologic history of Earth, a unit of time within the Cenozoic Era, beginning 2,588,000 years ago and continuing to the present day. The Quaternary has been characterized by several periods of glaciation (the “ice ages” of common lore), when ice sheets many kilometres thick have.
This article summarizes the geological and paleoceanographic evidence of the Quaternary ice sheets, with emphasis on the chronology of glacial-interglacial cycles and the geographic distribution of the ice sheets.
