The existence of past ice ages was discovered by several 19th century geologists from scratch marks on rocks, erratic boulders, moraines, and other physical observations. As early as 1920, Chamberlain provided a map of the North American and Greenland ice sheets at the last glacial maximum that...
Some Genetic Consequences of Ice Ages, and Their Role in Divergence and Speciation. Biol. J. Linn. Soc. 1996, 58, 247–276. [Google Scholar] [CrossRef] Gómez-Orellana, L.; Ramil-Rego, P.; Muñoz Sobrino, C. The Response of Vegetation at the End of the Last Glacial Period (MIS ...
There have been at least five significant ice ages in Earth’s history, with approximately a dozen epochs of glacial expansion occurring in the past 1 million years. Humans developed significantly during the most recent glaciation period, emerging as the dominant land animal afterward as megafauna ...
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...
000 years ago. Ice ages are normal cyclical events driven by a host of various factors such as solar activity, atmospheric composition, ocean currents, Earth's position in space, and continental movements, to name a few. The interaction between these factors is still the subject of intense ...
An ice age is a long period of reduction in the temperature of Earth’s surface and atmosphere, 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...
To the northwest, it is replaced by drift dominated by locally derived rock of the Canadian Shield. The sense and orientation of ice-erosional features demonstrate that Hudson Strait drift is associated with northeasterly ice flow that crossed the tip of Meta Incognita Peninsula; local drift, ...
Ice Breakers of the Niagara River Power Companies have been generating hydro-electric power from water drawn from the upper Niagara River since the 1880’s. Since that time, ice floes in the Niagara River during the winter season have been reeked havoc when ice floes often became ice jams blo...
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...
These ages indicate that recent ice cover has likely been cold-based and non-erosive, failing to remove inherited cosmogenic nuclides from previous periods of exposure, although the youngest boulder may provide a maximum limiting deglaciation age. Sediment cores collected from Delta Sø, a glacially...