首页
登录
职称英语
1 Permafrost occurs in areas where the mean annual temperature is at or below mi
1 Permafrost occurs in areas where the mean annual temperature is at or below mi
游客
2025-02-04
30
管理
问题
1 Permafrost occurs in areas where the mean annual temperature is at or below minus nine degrees Celsius. In Canada, where over fifty percent of the land area is permanently frozen, the depth of the permafrost ranges from two meters at the southern edge to as many as 300 meters in the far north. Almost all of the soil moisture occurs in the form of ground ice, which creates a challenge for the plants and animals that must survive in the North.
2 Temperature changes take a long time to penetrate the ground, and deep layers that froze during the last Ice Age remain insulated from current surface conditions. A thin surface layer may thaw if air temperatures rise above freezing in the summer. However, a brief thaw promotes the growth of sparse vegetation, which acts as an insulating layer for the lower levels, keeping them frozen. [br] Why do the deep layers of ground remain frozen even when temperatures rise above freezing?
选项
A、Small variations in temperature do not affect surface conditions.
B、Climate change in the North is contributing to a new Ice Age.
C、The ground thaws only when the temperature rises and falls rapidly.
D、Vegetation insulates the deep layers from surface temperatures.
答案
D
解析
The deep layers of ground remain frozen because vegetation insulates them from surface temperatures. Clues: ...deep layers...remain insulated from current surface conditions; ...sparse vegetation, which acts as an insulating layer for the lower levels, keeping them frozen.
转载请注明原文地址:https://tihaiku.com/zcyy/3942775.html
相关试题推荐
1Permafrostoccursinareaswherethemeanannualtemperatureisatorbelowmi
1Permafrostoccursinareaswherethemeanannualtemperatureisatorbelowmi
Alockoutoccurswhenmanagement______workersfromreturningtowork.A、prevents
一年一度的中国国际教育展于2000年由中国教育国际交流协会发起。该协会是中国境内最具影响力的教育协会之一。TheannuallyheldChinaEdu
Itiswisetohaveanannualphysicalexaminationafterage50;earlierifthere
Ahostiletakeoveroccurswhenthetargetcompanydoesnotinviteorapprovean
Ifcauliflowersarenot______fromextremetemperatures,theheadsgetdiscolor
Uniformaccelerationoccursaccordingtotherateofchangeremainsthesameove
Productswhicharemadefromdirtsandare______hightemperaturesareknownas
Ifcauliflowersareexposedfromextremetemperatures,theheadsgetdiscolored.
随机试题
[originaltext]W:Thecompetitionscheduledfortodayhasbeencancelled.Theho
—Whoareyourmaincompetitors?—Itdependsontheregion.Therearealotoflo
WhenRobertoFelizcametotheUSAfromtheDominicanRepublic,heknewonly
某递延年金,前3年没有发生额,计划从第4年初开始,无限期每年年初支付10元。假设
中国特色社会主义进入新时代,我国社会主要矛盾发生了变化,并没有改变的事实是(
(2013年)海洋潮汐观测中,岸边水位站水位观测允许偏差为()cm。A.
计算机病毒是指能够侵入计算机系统,并在计算机系统中潜伏、传播、破坏系统正常工作的
根据《房屋建筑与装饰工程工程量计算规范》(GB50854-2013),现浇钢筋
PTH的作用为抑制A.溶骨 B.肾小管憐再吸收 C.cAMP活性 D.
某施工单位与建设单位签订了一个施工承包合同,合同中约定2005年10月1日竣工。
最新回复
(
0
)