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
68
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
Americancitiesare【C1】______otherdriesaroundtheworld.Ineverycountry,citiesreflectthe【C2】______oftheculture.Cit
Fiona’sanxietyaboutherhusbandmadeheratoo_______visitoratthelawyer’soffice.
Peopletendtobuymorethingsthan______.
Fortheexecutiveproducerofanetworknightlynewsprogram,theworkdayoftenbeginsatmidnight—asminedidduringsevenyea
______hispoorrecordinschool,theboardthinksthatheshouldstudyhard.
Theenergygainedfromthesuncanthenbeusedduringthenighttoenablethenecessarychemicalreactionsto______inhisbod
Themessageisclear:Justasteaandbananacant’tgotogether,______shouldthesonofalow-classfamilyexpecttomarrythe
AbortionShouldBeKeptOutoftheCriminalCodeAbortionistheterminationofpregnancybeforethefetusiscapableofin
Whywouldanyonewanttosetasideadaytohonoralowlylittlegroundhog?Theanswertothatquestionisnotcertain,butagr
HewasthesilentofthestormthateruptedaftertheviolentdeathofDiana,PrincessofWales.Theonlysurvivorofthehorrif
随机试题
列出信息系统性能评价的5个指标。
A、散结消瘿B、逐痰降火C、燥湿化痰、理气和胃D、清热化痰,止咳E、健脾祛湿、化痰息风半夏天麻丸的功能是
下列地表水水域环境功能属Ⅲ类的是()。
下列费用项目中,不在单位工程施工图预算编制范围之内的是()。
BHJ集团公司主要业务包括高新园区的开发建设、管理服务,高新技术成果转化和高科技企业经营管理。经过10多年的发展,目前形成了以电子元器件、新材料生产为主体的高新技术产业群。公司成立初期,分配形式单一,薪酬长期处于低水平状态,内部差距不明显,以人定岗的现象十
唐三彩是一种盛行于清代的陶器,以黄、白、黑色为基本颜色。()
DDBS中的“数据分片”是指______。
PartⅡReadingComprehension(SkimmingandScanning)Directions:Inthispartyouwillhave15minutestogooverthepassagequ
WhenLaurieAronsonwasover35,shedidnotfeelworriedbecauseshewasunwillingtogetmarried.Todayanewgenerationofs
A、Sheforgottomakeacalltotheman.B、Heransweringmachinewasbroken.C、Shedidn’tgettheman’smessages.D、Shecouldn’t
最新回复
(
0
)