These are clustered into four broad ice ages-periods with cool temperatures and a significant continental ice sheet (at times, up to one-third of Earth's land surface was covered), separated by interglacial periods of 10-15 millennia. Nomadic humans, with fire, weapons and language, were ...
1.D。由上文中的Ice Ages以及下文中的 the temperatures wereso low可知,冰河时代是一段漫长的、“极度(extreme)”寒冷的时期。2.B。根据常识以及下文中的Over 1/3 of the Earth's land wasburied in ice可知,冰川“覆盖了(covered)”地球表面的大部分面积。3.A。由上文中的 theories和该空后的 why Ice...
美['ɪsɪdʒ] 英['ɪsɪdʒ] na.【地】冰期;冰河时代 网络冰河世纪;冰河时期乐团;冰河期 复数:Ice Ages 英汉 英英 网络释义 na. 1. 【地】冰期;冰河时代
ice agesprecession cyclesThe Earth''s climate is affected, among other factors, by the precession angle. Decrease of the precession angle is accompanied by a noticeable climate cool-down. As soon as Earth''s average near-surface temperature reaches some critical value, glaciation emerges. The ...
根据第四段“The current ice age we’re in is not the first the Earth has experienced. At least five major ice ages have occurred throughout Earth’s history.(我们现在所处的冰河时代并不是地球第一次经历冰河时代。 在整个地球历史上,至少发生过五个主要的冰期)”可推知,作者最可能在第五段写的...
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. ...
【题目】There have been about 11 different Ice Ages on the Earth. An Ice Age is a long period of 1 coldness.When it occurred, glaciers, slowly moving masses of ice, 2 much of the Earth's surface Several theories are usually given to 3 why Ice Ages happened. One says that the ...
At the end of the last global ice age, the deep-frozen Earth reached a built-in limit of climate change and thawed into a slushy planet.Results from a Virginia Tech-led study provide the first direct geochemical evidence of the slushy planet — otherw... ...
A key pacemaker of ice ages on the Earth is climatic forcing due to variations in planetary orbital parameters. Recent Mars exploration has revealed dusty, water-ice-rich mantling deposits that are layered, metres thick and latitude dependent, occurring
By making comparsons.Ages, called glacial periods () or interglacial D. By citing scientific findings periods that operate in cycles of 40,000 and 100,000The typical average global temperature when the Earth is not in an Ice Age is about 22 C. During33. What is considered to lead to ...