首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typically destroy ice fields, as they did in
Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typically destroy ice fields, as they did in
admin
2012-03-21
70
问题
Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typically destroy ice fields, as they did in 1980 when 70 of Mount Saint Helens ice cover was demolished. During long dormant intervals, glaciers gain the upper hand cutting deeply into volcanic cones and eventually reducing them to rubble. Only rarely do these competing forces of heat and cold operate in perfect balance to create a phenomenon such as the steam caves at Mount Rainier National Park.
Located inside Rainier’s two ice filled summit craters, these caves form a labyrinth of tunnels and vaulted chambers about one and one half miles in total length. Their creation depends on an unusual combination of factors that nature almost never brings together in one place. The cave making recipe calls for a steady emission of volcanic gas and heat, a heavy annual snowfall at an elevation high enough to keep it from melting during the summer, and a bowl shaped crater to hold the snow.
Snow accumulating yearly in Rainier’s summit craters is compacted and compressed into a dense form of ice called firm, a substance midway between ordinary ice and the denser crystalline ice that makes up glaciers. Heat rising from numerous openings (called fumaroles) along the inner crater walls melts out chambers between the rocky walls and the overlying ice pack. Circulating currents of warm air then melt additional openings in the firm ice, eventually connecting the individual chambers and, in the larger of Rainier’s the crater’s, forming a continuous passageway the extends two thirds of the Way around the crater’s interior.
To maintain the cave system, the elements of fire under ice must remain in equilibrium, enough snow must fill the crater each year to replace that melted from below. If too much volcanic heat is discharged, the crater’s ice pack will melt away entirely and the caves will vanish along with the snows of yesteryear. If too little heat is produced, the ice, replenished annually by winter snowstorms, will expand, pushing against the enclosing crater walls and smothering the present caverns in solid firm ice.
According to the passage, heat from Mount Rainier’s summit craters rises from_____.
选项
A、crystalline ice
B、firms
C、chambers
D、fumaroles
答案
D
解析
细节理解题。见第三段中“eat rising from numerous openings(called fumaroles)”。
转载请注明原文地址:https://www.kaotiyun.com/show/5smK777K
0
专业英语四级
相关试题推荐
Marriagehasbeenanimportantpartofpeople’slifefromtheearlytimes.MostAmericanmarriagesnowadays,especiallyflintma
Americancitiesare【C1】______otherdriesaroundtheworld.Ineverycountry,citiesreflectthe【C2】______oftheculture.Cit
Educationistooimportanttotake【C1】______,whenpeopletakeanythingforseriously,theyput【C2】______blinderswhichcaus
Yetthedifferenceintomeandlanguagemuststrikeus,sosoonasitisphilosophythatspeaks:thatchangeshouldremindusth
ThepollutionquestionaswellasseveralotherissuesisgoingtobediscussedwhentheCongressisin______againnextspring.
Theyoungpeoplearebecomingincreasinglyfilm______.
IsthereanyevidencethatthestandardofEnglishasaforeignlanguagehasimprovedintheyearssincetheSecondWorldWar?N
HewasthesilentofthestormthateruptedaftertheviolentdeathofDiana,PrincessofWales.Theonlysurvivorofthehorrif
Markoftenattemptstoescape______wheneverhebreakstrafficregulations.
随机试题
“明礼诚信”是中华民族的传统美德,而且也是现阶段我国《公民道德实施纲要》大力倡导的道德规范,这说明道德具有()。
Scientistshadtofindoutmanythings【C1】______theycouldlandmen【C2】______themoon.Theyneededmore【C3】______aboutspacecon
混合痔是指
A.异丙托溴铵吸入剂B.沙丁胺醇吸入剂C.氨茶碱D.扎鲁司特片E.布地奈德吸入剂轻度持续性哮喘缓解期首选的控制药物是
一肾病综合征患儿,起病早期使用利尿剂后,出现烦躁不安,四肢湿冷,脉搏细数,血压下降,周身有花纹,则此患儿最可能合并
财产税类是以纳税人拥有的财产数量或财产价值为征税对象的一类税收。我国现行的车船税就属于财产税类。()
负强化是运用惩罚排除不良行为的过程。()
阅读以下材料,完成22——25题 自2020年5月1日《北京市生活垃圾管理条例》(以下简称《条例》)实施以来,本市垃圾分类工作成效显著,全市厨余垃圾分出量增长、其他垃圾日清运量下降的良好态势得到巩固。10月份,全市家庭厨余垃圾分出量从《条例》实施前的3
题目给定资料反映了某市的“亲情逼迁”模式,请结合给定资料,概括问题并提出相应建议。要求:全面、简明,有针对性。不超过250字。材料近日,某市曝出“亲情逼迁”模式。这一模式其实并不新鲜,甚至可谓“复古”。早在10年前.某地就曾滥用政府权力实行“连坐”
Withtheaccelerationoftechnologicaladvances,manypeopleconsiderapersonalcomputer______afteronlythreeyears.
最新回复
(
0
)