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
2023-10-17
23
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] Much of the land in Alaska was permanently frozen, or frozen for most of the year, thus maintaining its integrity.
选项
答案
阿拉斯加的大部分土地曾经是常年冰冻,或是一年中多数时间都保持冰冻状态,以此保持它的完整。
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3105369.html
相关试题推荐
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Chinaisnowexperiencingthelargestmassmigrationofpeople,anestimated230
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
Alaskaisdisappearingslowlybutsurely.Sincethe1950s,itisestimatedt
ThelargestandsmalleststatesoftheUnitedStatesare______.A、AlaskaandRho
随机试题
Whatcausedthedoctorsandscientiststocallformoreattentiontoyoungpeopl
Choosethewordmostnearlyoppositeinmeaningtothecapitalizedword:GRATUI
Peopleinbusiness______hireartistsforthatkindofworksaythatsimpleartis
Scientists’hypothesesareguesseswhicharealreadysupportedbyacertainamou
关于履约保证金的说法,正确的有()。A:交纳履约保证金是中标后签订合同的必备条
成年期正畸治疗的目标,不包括A.前牙区美观和协调 B.保障牙周的健康 C.以
依据断路器运维细则规定,断路器的()应写入变电站现场专用规程。动作次数
廉租住房的保障方式是()。A.货币配租和实物补贴 B.货币补贴和实
注册会计师如果认为期初余额对本期财务报表存在重大影响,但无法对其获取充分、适当的
钢筋原材料进场检验验收批组成中,热轧圆盘条,热轧光圆钢筋,热轧带肋钢筋和余热处理
最新回复
(
0
)