首页
登录
职称英语
Alaska is disappearing slowly but surely. Since the 1950s, it is estimated t
Alaska is disappearing slowly but surely. Since the 1950s, it is estimated t
游客
2024-08-14
37
管理
问题
Alaska is disappearing slowly but surely. Since the 1950s, it is estimated that as much as 15 percent of Alaska’s area has disappeared. But how can a whole state be disappearing?
One reason for Alaska’s gradual disappearance is the melting of its glaciers. According to one geologist at the US Geological Survey, about 98 percent of Alaska’s glaciers are either unmoving or diminishing. This diminishing seems mainly due to the increase in global temperatures. Since the 1960s, the average year-round temperature has increased by 5℉. Furthermore, the average winter temperature has increased by 8℉. Presently, an estimated 24 cubic miles of ice is disappearing from Alaskan glaciers every year. It may be even more in the near future, as some scientists predict that the average world temperature could go up 2. 5 to 10°F by the year 2100.
Another problem contributing to Alaska’s gradual disappearance is its thawing permafrost.(74)
Much of the land in Alaska was permanently, frozen for most of the year, thus maintaining its integrity
. Now, the thawing permafrost is causing a number of problems on land. Roads and utility poles are collapsing. Also, the hard permafrost which originally prevented beaches from eroding during violent storms is now melting. Affected villages are forced to relocate. For villages on small low islands, one terrible storm could wipe out the entire community.
The melting permafrost and increasing temperature are also having a negative impact on the forests of Alaska. As the permafrost under the forests melts, insects that normally don’t turn up until the warmer seasons are appearing sooner. The spruce-bark beetle, for example, is increasing in numbers as a result of global warming. It usually takes about two years for these beetles to grow and reproduce in very cold weather. However, due to the increase in temperatures, spruce-bark beetles are damaging as many trees in one year as they previously damaged in two. At this rate, Alaska’s forest won’t survive the turn of the century.
Some scientists believe that human activity is linked to a global increase in weather temperature. Whether the rising temperatures are caused by human activity or natural changes, the fact remains that Alaska is warming. Some others argue that global warming may be a normal trend on the Earth’s temperature chart.(75)
One theory argues that we are near the end of a so-called " Little Ice Age" , and the retreat of the glaciers is a natural result of this cycle. Whether natural or produced by humans, there is little hope for the immediate future of glaciers as we know them.
Horribly, this could be a preview of what will happen to the rest of the world in the next century. [br] How much ice is melting each year according to the survey?
选项
答案
24 cubic miles of ice
解析
(文章第二段倒数第二句提到an estimated 24 cubic miles of ice is disappearing from Alaskan glaciers every year。)
转载请注明原文地址:https://tihaiku.com/zcyy/3719981.html
相关试题推荐
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Chinaisnowexperiencingthelargestmassmigrationofpeople,anestimated230
Whatreleasedanestimated8.7milliontonsoftheglobalwarminggas?[br][or
Whatreleasedanestimated8.7milliontonsoftheglobalwarminggas?[br][or
Whatreleasedanestimated8.7milliontonsoftheglobalwarminggas?[original
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
随机试题
Lookingtoimproveyourlanguageskills,butdon’thavethetimetogoovers
Accordingtothepassage,theaverageI.Q.is[br][originaltext]Thereare
Dr.Smith,togetherwithhiswifeandtwosons,_____toarriveontheeveningf
与齿轮传动相比较,链传动的优点是()。A.传动效率高 B.工作平稳,无噪声
关于作业条件危险评价法的简化公式为D=L·E·C,说法不正确的是()。A.L代表
马某,男,要求固定修复。检查:缺失,缺隙较大;不松,叩(-);松Ⅰ°,叩(-);
覆冰天气时,观察隔离开关外绝缘的覆冰厚度及冰凌桥接程度,覆冰厚度不超过()mm
下列相似意思、不同形式的表达,按语气由轻到重依次排列正确的是: ①机动车冒黑烟
依据法律规定,在管制的判决和执行方面,下列说法中正确的有()。A.管制的期限为
下列应计入其他支出项目的是()。A.对外提供劳务成本 B.管理用固定资产折旧
最新回复
(
0
)