The history of ice ages on Earth, extending back more than 2 Ga (10 9 years), has been established by the recognition in strata of many ages of the assemblage of erosional features and deposits generated by glacial activity. The most useful indicators are widespread diamictite, striated and ...
But in fact there have been many ice ages, most of them long before humans made their first appearance. And the familiar picture of an ice age is of a comparatively mild one: others were so severe that the entire Earth froze over, for tens or even hundreds of millions of years. In fa...
Paleoceanography, that is, the study of ocean history, emerged with the investigation of the record of the ice ages in cores from the deep seafloor. Initial efforts by W. Schott (1905–1989) in the 1930s were based on very short cores. Thus, it was the Swedish Deep Sea Expedition (1947...
resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth’s climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet. Earth is currently in the Quaternary glaciation.[1]Individual pulses of...
Detailed correlations of ancient glacial deposits, based on temporal records of carbon and strontium isotopes in seawater, indicate four (and perhaps five) discrete ice ages in the terminal Proterozoic Eon. The close and repeated stratigraphic relationship between C-isotopic excursions and glaciogenic ...
Ice Ages in Earth History G.M. Young, in Sediment Provenance, 2017 1 Introduction The record preserved in sedimentary rocks suggests that throughout most of Earth's 4.6-Ga history the surface of the planet was free of large ice-covered areas (continental glaciers or ice sheets). It is ther...
In the much more distant past, other ice ages have occurred.\ 5.According to paragraph 5, in what way is the present time unusual in the history of Earth? A.There are glaciers. B.More land is covered by glaciers than at any time in the past. C.There is no ice age. D.No ...
ICE AGESHISTORYRESPONSESEVOLUTIONARYBIODIVERSITYSPECIATIONCOLONIZATIONClimate change in the Arctic is a growing concern for natural resource conservation and ... AG Hope,E Waltari,DC Payer,... - 《Nature Climate Change》 被引量: 89发表: 2013年 On the nature and origin of "muck" deposits in the...
woolly mammoth: A species of large, hairy elephants that roamed the northern parts of the world during the last Ice Age. tiger: The largest species of the cat family, known for its striped coat and powerful build. early human: Refers t...
Owing to the gradual increase of Earth’s orbital obliquity43, seasonality in high northern latitudes increased significantly at 2.6 Ma42. Furthermore, the uplift of the Arctic regions, related to glacial isostatic rebound and the dynamics of the ice with variable thicknesses and extents, and ...